# coding=utf-8
# Copyright 2026 The Qwen team, Alibaba Group and the HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import math
from dataclasses import dataclass
from typing import Callable, Optional, Union

import numpy as np
import torch
from torch import nn
from torch.nn import functional as F

from transformers.activations import ACT2FN
from transformers.cache_utils import Cache, DynamicCache
from transformers.generation import GenerationMixin
from transformers.integrations import use_kernel_forward_from_hub
from transformers.masking_utils import create_causal_mask
from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
from transformers.modeling_layers import GradientCheckpointingLayer
from transformers.modeling_outputs import (
    BaseModelOutput,
    BaseModelOutputWithPast,
    MoeCausalLMOutputWithPast,
)
from transformers.modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
from transformers.processing_utils import Unpack
from transformers.utils import auto_docstring, can_return_tuple
from transformers.utils.deprecation import deprecate_kwarg
from transformers.utils.generic import TransformersKwargs

try:
    from transformers.utils.generic import check_model_inputs  # type: ignore
except Exception:  # pragma: no cover
    # Older/newer Transformers builds may not expose `check_model_inputs`.
    # It is only used as a lightweight decorator, so a no-op fallback keeps
    # the model importable while preserving runtime behavior.
    def check_model_inputs(*_args, **_kwargs):  # type: ignore
        def _decorator(fn):
            return fn

        return _decorator

from .configuration_qwen3_asr import (
    Qwen3ASRAudioEncoderConfig,
    Qwen3ASRConfig,
    Qwen3ASRThinkerConfig,
)


@use_kernel_forward_from_hub("RMSNorm")
class Qwen3ASRTextRMSNorm(nn.Module):
    def __init__(self, hidden_size, eps: float = 1e-6) -> None:
        """
        Qwen3ASRTextRMSNorm is equivalent to T5LayerNorm
        """
        super().__init__()
        self.weight = nn.Parameter(torch.ones(hidden_size))
        self.variance_epsilon = eps

    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
        input_dtype = hidden_states.dtype
        hidden_states = hidden_states.to(torch.float32)
        variance = hidden_states.pow(2).mean(-1, keepdim=True)
        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
        return self.weight * hidden_states.to(input_dtype)

    def extra_repr(self):
        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"


def rotate_half(x):
    """Rotates half the hidden dims of the input."""
    x1 = x[..., : x.shape[-1] // 2]
    x2 = x[..., x.shape[-1] // 2 :]
    return torch.cat((-x2, x1), dim=-1)


def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
    """
    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
    """
    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
    if n_rep == 1:
        return hidden_states
    hidden_states = hidden_states[:, :, None, :, :].expand(batch, num_key_value_heads, n_rep, slen, head_dim)
    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)


def eager_attention_forward(
    module: nn.Module,
    query: torch.Tensor,
    key: torch.Tensor,
    value: torch.Tensor,
    attention_mask: Optional[torch.Tensor],
    scaling: float,
    dropout: float = 0.0,
    **kwargs: Unpack[TransformersKwargs],
):
    key_states = repeat_kv(key, module.num_key_value_groups)
    value_states = repeat_kv(value, module.num_key_value_groups)

    attn_weights = torch.matmul(query, key_states.transpose(2, 3)) * scaling
    if attention_mask is not None:
        causal_mask = attention_mask[:, :, :, : key_states.shape[-2]]
        attn_weights = attn_weights + causal_mask

    attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to(query.dtype)
    attn_weights = nn.functional.dropout(attn_weights, p=dropout, training=module.training)
    attn_output = torch.matmul(attn_weights, value_states)
    attn_output = attn_output.transpose(1, 2).contiguous()

    return attn_output, attn_weights


def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
    """Applies Rotary Position Embedding to the query and key tensors.

    Args:
        q (`torch.Tensor`): The query tensor.
        k (`torch.Tensor`): The key tensor.
        cos (`torch.Tensor`): The cosine part of the rotary embedding.
        sin (`torch.Tensor`): The sine part of the rotary embedding.
        position_ids (`torch.Tensor`, *optional*):
            Deprecated and unused.
        unsqueeze_dim (`int`, *optional*, defaults to 1):
            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
    Returns:
        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
    """
    cos = cos.unsqueeze(unsqueeze_dim)
    sin = sin.unsqueeze(unsqueeze_dim)
    q_embed = (q * cos) + (rotate_half(q) * sin)
    k_embed = (k * cos) + (rotate_half(k) * sin)
    return q_embed, k_embed


class Qwen3ASRTextAttention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(self, config: Qwen3ASRConfig, layer_idx: int):
        super().__init__()
        self.config = config
        self.layer_idx = layer_idx
        self.head_dim = getattr(config, "head_dim", config.hidden_size // config.num_attention_heads)
        self.num_key_value_groups = config.num_attention_heads // config.num_key_value_heads
        self.scaling = self.head_dim**-0.5
        self.attention_dropout = config.attention_dropout
        self.is_causal = True

        self.q_proj = nn.Linear(
            config.hidden_size, config.num_attention_heads * self.head_dim, bias=config.attention_bias
        )
        self.k_proj = nn.Linear(
            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
        )
        self.v_proj = nn.Linear(
            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
        )
        self.o_proj = nn.Linear(
            config.num_attention_heads * self.head_dim, config.hidden_size, bias=config.attention_bias
        )
        self.q_norm = Qwen3ASRTextRMSNorm(
            self.head_dim, eps=config.rms_norm_eps
        )  # unlike olmo, only on the head dim!
        self.k_norm = Qwen3ASRTextRMSNorm(
            self.head_dim, eps=config.rms_norm_eps
        )  # thus post q_norm does not need reshape

    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
    def forward(
        self,
        hidden_states: torch.Tensor,
        position_embeddings: tuple[torch.Tensor, torch.Tensor],
        attention_mask: Optional[torch.Tensor],
        past_key_values: Optional[Cache] = None,
        cache_position: Optional[torch.LongTensor] = None,
        **kwargs: Unpack[FlashAttentionKwargs],
    ) -> tuple[torch.Tensor, Optional[torch.Tensor]]:
        input_shape = hidden_states.shape[:-1]
        hidden_shape = (*input_shape, -1, self.head_dim)

        query_states = self.q_norm(self.q_proj(hidden_states).view(hidden_shape)).transpose(1, 2)
        key_states = self.k_norm(self.k_proj(hidden_states).view(hidden_shape)).transpose(1, 2)
        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)

        cos, sin = position_embeddings
        query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)

        if past_key_values is not None:
            # sin and cos are specific to RoPE models; cache_position needed for the static cache
            cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position}
            key_states, value_states = past_key_values.update(key_states, value_states, self.layer_idx, cache_kwargs)

        attention_interface: Callable = eager_attention_forward
        if self.config._attn_implementation != "eager":
            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]

        attn_output, attn_weights = attention_interface(
            self,
            query_states,
            key_states,
            value_states,
            attention_mask,
            dropout=0.0 if not self.training else self.attention_dropout,
            scaling=self.scaling,
            **kwargs,
        )

        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
        attn_output = self.o_proj(attn_output)
        return attn_output, attn_weights


class Qwen3ASRTextMLP(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.hidden_size = config.hidden_size
        self.intermediate_size = config.intermediate_size
        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
        self.act_fn = ACT2FN[config.hidden_act]

    def forward(self, x):
        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
        return down_proj


class Qwen3ASRThinkerTextDecoderLayer(GradientCheckpointingLayer):
    def __init__(self, config: Qwen3ASRConfig, layer_idx: int):
        super().__init__()
        self.hidden_size = config.hidden_size

        self.self_attn = Qwen3ASRTextAttention(config=config, layer_idx=layer_idx)

        self.mlp = Qwen3ASRTextMLP(config)
        self.input_layernorm = Qwen3ASRTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
        self.post_attention_layernorm = Qwen3ASRTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)

    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
    def forward(
        self,
        hidden_states: torch.Tensor,
        position_embeddings: tuple[torch.Tensor, torch.Tensor],
        attention_mask: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Cache] = None,
        use_cache: Optional[bool] = False,
        cache_position: Optional[torch.LongTensor] = None,
        **kwargs: Unpack[TransformersKwargs],
    ) -> torch.Tensor:
        residual = hidden_states
        hidden_states = self.input_layernorm(hidden_states)
        # Self Attention
        hidden_states, _ = self.self_attn(
            hidden_states=hidden_states,
            attention_mask=attention_mask,
            position_ids=position_ids,
            past_key_values=past_key_values,
            use_cache=use_cache,
            cache_position=cache_position,
            position_embeddings=position_embeddings,
            **kwargs,
        )
        hidden_states = residual + hidden_states

        # Fully Connected
        residual = hidden_states
        hidden_states = self.post_attention_layernorm(hidden_states)
        hidden_states = self.mlp(hidden_states)
        hidden_states = residual + hidden_states
        return hidden_states


@auto_docstring
class Qwen3ASRPreTrainedModel(PreTrainedModel):
    config: Qwen3ASRConfig
    base_model_prefix = "model"
    supports_gradient_checkpointing = True
    _skip_keys_device_placement = "past_key_values"
    _supports_flash_attn = True
    _supports_sdpa = True

    _can_compile_fullgraph = True
    _supports_attention_backend = True
    _can_record_outputs = {
        "attentions": Qwen3ASRTextAttention,
    }


@dataclass
class Qwen3ASRThinkerCausalLMOutputWithPast(MoeCausalLMOutputWithPast):
    r"""
    Args:
        rope_deltas (`torch.LongTensor` of shape `(batch_size, )`, *optional*):
            The rope index difference between sequence length and multimodal rope.
    """

    rope_deltas: Optional[torch.LongTensor] = None


def _get_feat_extract_output_lengths(input_lengths):
    """
    Computes the output length of the convolutional layers and the output length of the audio encoder
    """

    input_lengths_leave = input_lengths % 100
    feat_lengths = (input_lengths_leave - 1) // 2 + 1
    output_lengths = ((feat_lengths - 1) // 2 + 1 - 1) // 2 + 1 + (input_lengths // 100) * 13
    return output_lengths


class Qwen3ASRPreTrainedModelForConditionalGeneration(Qwen3ASRPreTrainedModel):
    def _prepare_4d_causal_attention_mask_with_cache_position(
        self,
        attention_mask: torch.Tensor,
        sequence_length: int,
        target_length: int,
        dtype: torch.dtype,
        device: torch.device,
        min_dtype: float,
        cache_position: torch.Tensor,
        batch_size: int,
    ):
        """
        Creates a causal 4D mask of shape `(batch_size, 1, query_length, key_value_length)` from a 2D mask of shape
        `(batch_size, key_value_length)`, or if the input `attention_mask` is already 4D, do nothing.

        Args:
            attention_mask (`torch.Tensor`):
                A 2D attention mask of shape `(batch_size, key_value_length)` or a 4D attention mask of shape `(batch_size, 1, query_length, key_value_length)`.
            sequence_length (`int`):
                The sequence length being processed.
            target_length (`int`):
                The target length: when generating with static cache, the mask should be as long as the static cache, to account for the 0 padding, the part of the cache that is not filled yet.
            dtype (`torch.dtype`):
                The dtype to use for the 4D attention mask.
            device (`torch.device`):
                The device to place the 4D attention mask on.
            min_dtype (`float`):
                The minimum value representable with the dtype `dtype`.
            cache_position (`torch.Tensor`):
                Indices depicting the position of the input sequence tokens in the sequence.
            batch_size (`torch.Tensor`):
                Batch size.
        """
        if attention_mask is not None and attention_mask.dim() == 4:
            # In this case we assume that the mask comes already in inverted form and requires no inversion or slicing.
            causal_mask = attention_mask
        else:
            causal_mask = torch.full(
                (sequence_length, target_length), fill_value=min_dtype, dtype=dtype, device=device
            )
            if sequence_length != 1:
                causal_mask = torch.triu(causal_mask, diagonal=1)
            causal_mask *= torch.arange(target_length, device=device) > cache_position.reshape(-1, 1)
            causal_mask = causal_mask[None, None, :, :].expand(batch_size, 1, -1, -1)
            if attention_mask is not None:
                causal_mask = causal_mask.clone()  # copy to contiguous memory for in-place edit
                mask_length = attention_mask.shape[-1]
                padding_mask = causal_mask[:, :, :, :mask_length] + attention_mask[:, None, None, :]
                padding_mask = padding_mask == 0
                causal_mask[:, :, :, :mask_length] = causal_mask[:, :, :, :mask_length].masked_fill(
                    padding_mask, min_dtype
                )

        return causal_mask


    def get_chunked_index(
        self, token_indices: torch.Tensor, tokens_per_chunk: int, remove_index: int
    ) -> list[tuple[int, int]]:
        """
        Splits token index list into chunks based on token value ranges.

        Given a list of token indices, returns a list of (start, end) index tuples representing
        slices of the list where the token values fall within successive ranges of `t_ntoken_per_chunk`.

        For example, if `t_ntoken_per_chunk` is 1000, the function will create chunks such that:
        - the first chunk contains token values < 1000,
        - the second chunk contains values >= 1000 and < 2000, and so on.

        Parameters:
            token_indices (`torch.Tensor` of shape `(seq_len, )`): A monotonically increasing list of
                                token index values.
            t_ntoken_per_chunk (`int`): Number of tokens per chunk (used as the chunk size threshold).
            remove_index (`int`) An index id to subtract from `token_indices` before chunking

        Returns:
            `list[tuple[int, int]]`: A list of tuples, each representing the start (inclusive)
                                and end (exclusive) indices of a chunk in `token_indices`.
        """

        def _iter():
            i, start_idx = 0, 0  # skip bos token
            current_chunk = 1
            while i < len(token_indices):  # skip eos token
                if token_indices[i] - remove_index >= current_chunk * tokens_per_chunk:
                    yield (start_idx, i)
                    start_idx = i
                    current_chunk += 1
                i += 1
            yield (start_idx, len(token_indices))

        return list(_iter())

    def get_rope_index(
        self,
        attention_mask: Optional[torch.Tensor] = None,
    ) -> tuple[torch.Tensor, torch.Tensor]:
        """
        Calculate the rope index in LLM.

        Explanation:
            Each embedding sequence contains text embedding.

        Args:
            input_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`):
                Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide
                it.
            attention_mask (`torch.Tensor` of shape `(batch_size, sequence_length)`, *optional*):
                Mask to avoid performing attention on padding token indices. Mask values selected in `[0, 1]`:

                - 1 for tokens that are **not masked**,
                - 0 for tokens that are **masked**.
            audio_seqlens (`torch.LongTensor` of shape `(num_audios)`, *optional*):
                The length of feature shape of each audio in LLM.

        Returns:
            position_ids (`torch.LongTensor` of shape `(3, batch_size, sequence_length)`)
            mrope_position_deltas (`torch.Tensor` of shape `(batch_size)`)
        """
        mrope_position_deltas = []

        position_ids = attention_mask.float().cumsum(-1) - 1
        position_ids.masked_fill_(attention_mask == 0, 1)
        position_ids = position_ids.unsqueeze(0).expand(3, -1, -1).to(attention_mask.device)
        max_position_ids = position_ids.max(0, keepdim=False)[0].max(-1, keepdim=True)[0]
        mrope_position_deltas = max_position_ids + 1 - torch.sum(attention_mask, dim=-1, keepdim=True)

        return position_ids, mrope_position_deltas


class Qwen3ASRAudioAttention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(self, config):
        super().__init__()
        self.embed_dim = config.d_model
        self.num_heads = config.encoder_attention_heads
        self.dropout = config.attention_dropout
        self.head_dim = self.embed_dim // self.num_heads
        self.num_key_value_groups = 1  # needed for eager attention
        self.config = config

        if (self.head_dim * self.num_heads) != self.embed_dim:
            raise ValueError(
                f"embed_dim must be divisible by num_heads (got `embed_dim`: {self.embed_dim}"
                f" and `num_heads`: {self.num_heads})."
            )
        self.scaling = self.head_dim**-0.5
        self.attention_dropout = 0.0
        self.is_decoder = False
        self.is_causal = False
        self.k_proj = nn.Linear(self.embed_dim, self.embed_dim, bias=True)
        self.v_proj = nn.Linear(self.embed_dim, self.embed_dim, bias=True)
        self.q_proj = nn.Linear(self.embed_dim, self.embed_dim, bias=True)
        self.out_proj = nn.Linear(self.embed_dim, self.embed_dim, bias=True)

    def forward(
        self,
        hidden_states: torch.Tensor,
        cu_seqlens: Optional[torch.Tensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        **kwargs,
    ) -> tuple[torch.Tensor, Optional[torch.Tensor], Optional[tuple[torch.Tensor]]]:
        """Input shape: Batch x Time x Channel"""

        seq_length, _ = hidden_states.size()

        query_states = self.q_proj(hidden_states).reshape(seq_length, self.num_heads, -1)
        key_states = self.k_proj(hidden_states).reshape(seq_length, self.num_heads, -1)
        value_states = self.v_proj(hidden_states).reshape(seq_length, self.num_heads, -1)

        query_states = query_states.transpose(0, 1).unsqueeze(0)
        key_states = key_states.transpose(0, 1).unsqueeze(0)
        value_states = value_states.transpose(0, 1).unsqueeze(0)
        max_seqlen = (cu_seqlens[1:] - cu_seqlens[:-1]).max()

        attention_interface: Callable = eager_attention_forward
        if self.config._attn_implementation != "eager":
            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]

        attn_output, _ = attention_interface(
            self,
            query_states,
            key_states,
            value_states,
            attention_mask=attention_mask,
            dropout=0.0 if not self.training else self.attention_dropout,
            scaling=self.scaling,
            cu_seq_lens_q=cu_seqlens,  # pass cu seq lens for FA2
            cu_seq_lens_k=cu_seqlens,
            max_length_q=max_seqlen,
            max_length_k=max_seqlen,
            is_causal=False,
            **kwargs,
        )

        attn_output = attn_output.reshape(seq_length, -1).contiguous()
        attn_output = self.out_proj(attn_output)

        return attn_output


class Qwen3ASRAudioEncoderLayer(GradientCheckpointingLayer):
    def __init__(self, config: Qwen3ASRAudioEncoderConfig):
        super().__init__()
        self.embed_dim = config.d_model
        self.self_attn = Qwen3ASRAudioAttention(config)
        self.self_attn_layer_norm = nn.LayerNorm(self.embed_dim)
        self.dropout = config.dropout
        self.activation_fn = ACT2FN[config.activation_function]
        self.activation_dropout = config.activation_dropout
        self.fc1 = nn.Linear(self.embed_dim, config.encoder_ffn_dim)
        self.fc2 = nn.Linear(config.encoder_ffn_dim, self.embed_dim)
        self.final_layer_norm = nn.LayerNorm(self.embed_dim)

    def forward(
        self,
        hidden_states: torch.Tensor,
        cu_seqlens: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
        **kwargs,
    ) -> torch.Tensor:
        """
        Args:
            hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)`
            attention_mask (`torch.FloatTensor`): attention mask of size
                `(batch, 1, tgt_len, src_len)` where padding elements are indicated by very large negative values.
            layer_head_mask (`torch.FloatTensor`): mask for attention heads in a given layer of size
                `(encoder_attention_heads,)`.
            output_attentions (`bool`, *optional*):
                Whether or not to return the attentions tensors of all attention layers. See `attentions` under
                returned tensors for more detail.
        """
        residual = hidden_states
        hidden_states = self.self_attn_layer_norm(hidden_states)
        hidden_states = self.self_attn(
            hidden_states=hidden_states,
            cu_seqlens=cu_seqlens,
            attention_mask=attention_mask,
            **kwargs,
        )
        hidden_states = residual + hidden_states
        residual = hidden_states
        hidden_states = self.final_layer_norm(hidden_states)
        hidden_states = self.fc1(hidden_states)
        hidden_states = self.activation_fn(hidden_states)
        hidden_states = self.fc2(hidden_states)
        hidden_states = residual + hidden_states

        if hidden_states.dtype == torch.float16:
            clamp_value = torch.finfo(hidden_states.dtype).max - 1000
            hidden_states = torch.clamp(hidden_states, min=-clamp_value, max=clamp_value)

        outputs = (hidden_states,)

        return outputs


class SinusoidsPositionEmbedding(nn.Module):
    def __init__(self, length, channels, max_timescale=10000):
        super().__init__()
        if channels % 2 != 0:
            raise ValueError("SinusoidsPositionEmbedding needs even channels input")
        log_timescale_increment = np.log(max_timescale) / (channels // 2 - 1)
        inv_timescales = torch.exp(-log_timescale_increment * torch.arange(channels // 2).float())
        scaled_time = torch.arange(length)[:, np.newaxis] * inv_timescales[np.newaxis, :]
        self.register_buffer(
            "positional_embedding",
            torch.cat([torch.sin(scaled_time), torch.cos(scaled_time)], dim=1),
            persistent=False,
        )

    def forward(self, seqlen: int):
        return self.positional_embedding[:seqlen, :]


@auto_docstring(
    custom_intro="""
    Transformer encoder consisting of *config.encoder_layers* self attention layers. Each layer is a
    [`Qwen3ASRAudioEncoderLayer`].
    """
)
class Qwen3ASRAudioEncoder(Qwen3ASRPreTrainedModel):
    config: Qwen3ASRAudioEncoderConfig
    main_input_name = "input_features"
    _no_split_modules = ["Qwen3ASRAudioEncoderLayer"]
    _supports_sdpa = True

    def __init__(self, config: Qwen3ASRAudioEncoderConfig):
        super().__init__(config)
        self.dropout = config.dropout

        embed_dim = config.d_model
        self.num_mel_bins = config.num_mel_bins
        self.max_source_positions = config.max_source_positions
        self.embed_scale = math.sqrt(embed_dim) if config.scale_embedding else 1.0
        self.n_window = config.n_window
        self.positional_embedding = SinusoidsPositionEmbedding(self.max_source_positions, embed_dim)
        self.layers = nn.ModuleList([Qwen3ASRAudioEncoderLayer(config) for _ in range(config.encoder_layers)])
        self.ln_post = nn.LayerNorm(config.d_model)
        self.gradient_checkpointing = False
        self.conv2d1 = nn.Conv2d(1, config.downsample_hidden_size, 3, 2, padding=1)
        self.conv2d2 = nn.Conv2d(config.downsample_hidden_size, config.downsample_hidden_size, 3, 2, padding=1)
        self.conv2d3 = nn.Conv2d(config.downsample_hidden_size, config.downsample_hidden_size, 3, 2, padding=1)
        self.conv_out = nn.Linear(
            config.downsample_hidden_size * ((((config.num_mel_bins + 1) // 2 + 1) // 2 + 1) // 2),
            config.d_model,
            bias=False,
        )
        self.proj1 = nn.Linear(config.d_model, config.d_model)
        self.act = ACT2FN[config.activation_function]
        self.proj2 = nn.Linear(config.d_model, config.output_dim)
        self.n_window_infer = self.config.n_window_infer
        self.conv_chunksize = self.config.conv_chunksize
        # Initialize weights and apply final processing
        self.post_init()

    def _freeze_parameters(self):
        for param in self.parameters():
            param.requires_grad = False
        self._requires_grad = False

    def get_input_embeddings(self) -> nn.Module:
        return self.conv1

    def set_input_embeddings(self, value: nn.Module):
        self.conv1 = value

    def _prepare_attention_mask(self, inputs_tensor: torch.Tensor, cu_seqlens: torch.Tensor) -> torch.Tensor:
        # Flash Attention 2 doesn't need a 4D mask and relies on `cu_seqlens/max_seqlen`
        # NOTE: the created attention masl only approximates the ragged FA2 attention by
        # allowing bidirectional attention within `cu_seqlens` blocks, and not attending between
        # blocks. Though it will not be a 100% match for FA2's `varlen` path
        if self.config._attn_implementation == "flash_attention_2":
            return None

        seq_length = inputs_tensor.shape[0]
        attention_mask = torch.full(
            [1, 1, seq_length, seq_length],
            torch.finfo(inputs_tensor.dtype).min,
            device=inputs_tensor.device,
            dtype=inputs_tensor.dtype,
        )
        for i in range(1, len(cu_seqlens)):
            attention_mask[..., cu_seqlens[i - 1] : cu_seqlens[i], cu_seqlens[i - 1] : cu_seqlens[i]] = 0
        return attention_mask

    @auto_docstring
    def forward(
        self,
        input_features,
        feature_lens=None,
        aftercnn_lens=None,
    ):
        r"""
        feature_lens (`torch.LongTensor` of shape `(batch_size,)`):
            mel length
        aftercnn_lens (`torch.LongTensor` of shape `(batch_size,)`):
            mel length after cnn
        """
        aftercnn_lens = _get_feat_extract_output_lengths(feature_lens)
        chunk_num = torch.ceil(feature_lens / (self.n_window * 2)).long()

        chunk_lengths = torch.tensor(
            [self.n_window * 2] * chunk_num.sum(),
            dtype=torch.long,
            device=feature_lens.device,
        )
        tail_chunk_index = F.pad(chunk_num, (1, 0), value=-1).cumsum(0)[1:]
        chunk_lengths[tail_chunk_index] = feature_lens % (self.n_window * 2)
        chunk_lengths[chunk_lengths == 0] = self.n_window * 2

        chunk_list = input_features.T.split(chunk_lengths.tolist(), dim=0)
        padded_feature = nn.utils.rnn.pad_sequence(chunk_list, batch_first=True).transpose(1, 2)
        feature_lens_after_cnn = _get_feat_extract_output_lengths(chunk_lengths)
        padded_mask_after_cnn = nn.utils.rnn.pad_sequence(
            [torch.ones(length, dtype=torch.bool, device=padded_feature.device) for length in feature_lens_after_cnn],
            batch_first=True,
        )
        padded_feature = padded_feature.unsqueeze(1)
        # Split to chunk to avoid OOM during convolution
        padded_embeds = []
        for chunk in padded_feature.split(self.conv_chunksize, dim=0):
            padded_embed = F.gelu(self.conv2d1(chunk))
            padded_embed = F.gelu(self.conv2d2(padded_embed))
            padded_embed = F.gelu(self.conv2d3(padded_embed))
            padded_embeds.append(padded_embed)
        padded_embed = torch.cat(padded_embeds, dim=0)
        b, c, f, t = padded_embed.size()
        padded_embed = self.conv_out(padded_embed.permute(0, 3, 1, 2).contiguous().view(b, t, c * f))

        positional_embedding = (
            self.positional_embedding.positional_embedding[: padded_embed.shape[1], :]
            .unsqueeze(0)
            .to(padded_embed.dtype)
        )
        padded_embed = padded_embed + positional_embedding
        hidden_states = padded_embed[padded_mask_after_cnn]
        cu_chunk_lens = [0]
        window_aftercnn = padded_mask_after_cnn.shape[-1] * (self.n_window_infer // (self.n_window * 2))
        for cnn_len in aftercnn_lens:
            cu_chunk_lens += [window_aftercnn] * (cnn_len // window_aftercnn)
            remainder = cnn_len % window_aftercnn
            if remainder != 0:
                cu_chunk_lens += [remainder]
        cu_seqlens = torch.tensor(cu_chunk_lens, device=aftercnn_lens.device).cumsum(-1, dtype=torch.int32)

        for encoder_layer in self.layers:
            layer_outputs = encoder_layer(
                hidden_states,
                cu_seqlens,
            )

            hidden_states = layer_outputs[0]

        hidden_states = self.ln_post(hidden_states)
        hidden_states = self.proj1(hidden_states)
        hidden_states = self.act(hidden_states)
        hidden_states = self.proj2(hidden_states)
        return BaseModelOutput(last_hidden_state=hidden_states)

    def padded_and_mask_function(self, tensor_list, tensor_len, padding_value=0, padding_side="right"):
        """
        Pads a sequence of tensors to their maximum length on indicated `padding_side`.
        Then prepares a mask so that pad tokens are not attended to.
        """
        max_len = tensor_len.max()
        dim = tensor_list[0].shape[0]
        padded_tensor = torch.full(
            size=(len(tensor_list), dim, max_len),
            fill_value=padding_value,
            dtype=self.dtype,
            device=tensor_list[0].device,
        )

        batch_mask = torch.zeros(
            (len(tensor_len), max_len),
            dtype=torch.long,
            device=padded_tensor.device,
        )
        for i, length in enumerate(tensor_len):
            batch_mask[i, :length] = 1
            padded_tensor[i, :, :length] = tensor_list[i]

        feature_lens_after_cnn = (tensor_len - 1) // 2 + 1
        max_len_after_cnn = feature_lens_after_cnn.max()
        batch_mask_after_cnn = torch.zeros(
            (len(tensor_len), max_len_after_cnn),
            dtype=torch.long,
            device=padded_tensor.device,
        )
        for i, length in enumerate(feature_lens_after_cnn):
            batch_mask_after_cnn[i, :length] = 1
        return (
            padded_tensor,
            batch_mask.unsqueeze(1),
            batch_mask_after_cnn.bool(),
        )


class Qwen3ASRThinkerTextRotaryEmbedding(nn.Module):
    inv_freq: torch.Tensor  # fix linting for `register_buffer`

    def __init__(self, config: Qwen3ASRConfig, device=None):
        super().__init__()
        if hasattr(config, "rope_scaling") and config.rope_scaling is not None:
            self.rope_type = config.rope_scaling.get("rope_type", "default")
        else:
            self.rope_type = "default"
        self.max_seq_len_cached = config.max_position_embeddings
        self.original_max_seq_len = config.max_position_embeddings

        self.config = config
        self.rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]

        inv_freq, self.attention_scaling = self.rope_init_fn(self.config, device)
        self.register_buffer("inv_freq", inv_freq, persistent=False)
        self.original_inv_freq = self.inv_freq

        self.mrope_section = config.rope_scaling.get("mrope_section", [24, 20, 20])

    def apply_interleaved_mrope(self, freqs, mrope_section):
        """Apply interleaved MRoPE to 3D rotary embeddings.
        Reorganizes frequency layout from chunked [TTT...HHH...WWW] to
        interleaved [THTHWHTHW...TT], preserving frequency continuity.
        args:
            x: (3, bs, seq_len, head_dim // 2)
            mrope_section: (3,)
        returns:
            x_t: (bs, seq_len, head_dim // 2)
        """
        freqs_t = freqs[0]  # just overwrite the first dimension T
        for dim, offset in enumerate((1, 2), start=1):  # H, W
            length = mrope_section[dim] * 3
            idx = slice(offset, length, 3)
            freqs_t[..., idx] = freqs[dim, ..., idx]
        return freqs_t

    @torch.no_grad()
    @dynamic_rope_update  # power user: used with advanced RoPE types (e.g. dynamic rope)
    def forward(self, x, position_ids):
        # In contrast to other models, Qwen3ASRThinker has different position ids for the grids
        # So we expand the inv_freq to shape (3, ...)
        if position_ids.ndim == 2:
            position_ids = position_ids[None, ...].expand(3, position_ids.shape[0], -1)
        inv_freq_expanded = self.inv_freq[None, None, :, None].float().expand(3, position_ids.shape[1], -1, 1)
        position_ids_expanded = position_ids[:, :, None, :].float()  # shape (3, bs, 1, positions)

        device_type = x.device.type if isinstance(x.device.type, str) and x.device.type != "mps" else "cpu"
        with torch.autocast(device_type=device_type, enabled=False):  # Force float32
            freqs = (inv_freq_expanded.float() @ position_ids_expanded.float()).transpose(2, 3)
            freqs = self.apply_interleaved_mrope(freqs, self.mrope_section)
            emb = torch.cat((freqs, freqs), dim=-1)
            cos = emb.cos() * self.attention_scaling
            sin = emb.sin() * self.attention_scaling

        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)


class Qwen3ASRThinkerTextMLP(nn.Module):
    def __init__(self, config, intermediate_size=None):
        super().__init__()
        self.config = config
        self.hidden_size = config.hidden_size
        self.intermediate_size = intermediate_size if intermediate_size is not None else config.intermediate_size
        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
        self.act_fn = ACT2FN[config.hidden_act]

    def forward(self, x):
        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
        return down_proj


@use_kernel_forward_from_hub("RMSNorm")
class Qwen3ASRThinkerTextRMSNorm(nn.Module):
    def __init__(self, hidden_size, eps=1e-6):
        """
        Qwen3ASRThinkerTextRMSNorm is equivalent to T5LayerNorm
        """
        super().__init__()
        self.weight = nn.Parameter(torch.ones(hidden_size))
        self.variance_epsilon = eps

    def forward(self, hidden_states):
        input_dtype = hidden_states.dtype
        hidden_states = hidden_states.to(torch.float32)
        variance = hidden_states.pow(2).mean(-1, keepdim=True)
        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
        return self.weight * hidden_states.to(input_dtype)

    def extra_repr(self):
        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"


class Qwen3ASRThinkerTextAttention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(self, config, layer_idx):
        super().__init__()
        self.config = config
        self.layer_idx = layer_idx
        self.head_dim = getattr(config, "head_dim", config.hidden_size // config.num_attention_heads)
        self.num_key_value_groups = config.num_attention_heads // config.num_key_value_heads
        self.scaling = self.head_dim**-0.5
        self.attention_dropout = config.attention_dropout
        self.is_causal = True

        self.q_proj = nn.Linear(
            config.hidden_size, config.num_attention_heads * self.head_dim, bias=config.attention_bias
        )
        self.k_proj = nn.Linear(
            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
        )
        self.v_proj = nn.Linear(
            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
        )
        self.o_proj = nn.Linear(
            config.num_attention_heads * self.head_dim, config.hidden_size, bias=config.attention_bias
        )
        self.q_norm = Qwen3ASRThinkerTextRMSNorm(
            self.head_dim, eps=config.rms_norm_eps
        )  # unlike olmo, only on the head dim!
        self.k_norm = Qwen3ASRThinkerTextRMSNorm(
            self.head_dim, eps=config.rms_norm_eps
        )  # thus post q_norm does not need reshape
        self.sliding_window = None

    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
    def forward(
        self,
        hidden_states: torch.Tensor,
        position_embeddings: tuple[torch.Tensor, torch.Tensor],
        attention_mask: Optional[torch.Tensor],
        past_key_values: Optional[Cache] = None,
        cache_position: Optional[torch.LongTensor] = None,
        **kwargs: Unpack[FlashAttentionKwargs],
    ) -> tuple[torch.Tensor, Optional[torch.Tensor]]:
        input_shape = hidden_states.shape[:-1]
        hidden_shape = (*input_shape, -1, self.head_dim)

        query_states = self.q_norm(self.q_proj(hidden_states).view(hidden_shape)).transpose(1, 2)
        key_states = self.k_norm(self.k_proj(hidden_states).view(hidden_shape)).transpose(1, 2)
        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)

        cos, sin = position_embeddings
        query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)

        if past_key_values is not None:
            # sin and cos are specific to RoPE models; cache_position needed for the static cache
            cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position}
            key_states, value_states = past_key_values.update(key_states, value_states, self.layer_idx, cache_kwargs)

        attention_interface: Callable = eager_attention_forward
        if self.config._attn_implementation != "eager":
            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]

        attn_output, attn_weights = attention_interface(
            self,
            query_states,
            key_states,
            value_states,
            attention_mask,
            dropout=0.0 if not self.training else self.attention_dropout,
            scaling=self.scaling,
            sliding_window=self.sliding_window,  # diff with Llama
            **kwargs,
        )

        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
        attn_output = self.o_proj(attn_output)
        return attn_output, attn_weights


@auto_docstring(
    custom_intro=(
        "Text part of Qwen3ASRThinker, "
    )
)
class Qwen3ASRThinkerTextModel(Qwen3ASRPreTrainedModel):
    config: Qwen3ASRConfig
    _no_split_modules = ["Qwen3ASRThinkerTextDecoderLayer"]
    config_class = Qwen3ASRConfig
    _can_record_outputs = {
        "hidden_states": Qwen3ASRThinkerTextDecoderLayer,
        "attentions": Qwen3ASRThinkerTextAttention,
    }

    def __init__(self, config: Qwen3ASRConfig):
        super().__init__(config)
        self.padding_idx = config.pad_token_id
        self.vocab_size = config.vocab_size

        self.embed_tokens = nn.Embedding(config.vocab_size, config.hidden_size, self.padding_idx)
        self.layers = nn.ModuleList(
            [Qwen3ASRThinkerTextDecoderLayer(config, layer_idx) for layer_idx in range(config.num_hidden_layers)]
        )
        self.norm = Qwen3ASRTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
        self.rotary_emb = Qwen3ASRThinkerTextRotaryEmbedding(config)
        self.gradient_checkpointing = False

        # Initialize weights and apply final processing
        self.post_init()

    @check_model_inputs()
    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Cache] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        use_cache: Optional[bool] = None,
        cache_position: Optional[torch.LongTensor] = None,
        **kwargs: Unpack[FlashAttentionKwargs],
    ) -> Union[tuple, BaseModelOutputWithPast]:
        if (input_ids is None) ^ (inputs_embeds is not None):
            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")

        # torch.jit.trace() doesn't support cache objects in the output
        if use_cache and past_key_values is None and not torch.jit.is_tracing():
            past_key_values = DynamicCache(config=self.config)

        if inputs_embeds is None:
            inputs_embeds = self.embed_tokens(input_ids)

        if cache_position is None:
            past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
            cache_position = torch.arange(
                past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1], device=inputs_embeds.device
            )

        # the hard coded `3` is for temporal, height and width.
        if position_ids is None:
            position_ids = cache_position.view(1, 1, -1).expand(3, inputs_embeds.shape[0], -1)
        elif position_ids.ndim == 2:
            position_ids = position_ids[None, ...].expand(3, position_ids.shape[0], -1)

        if position_ids.ndim == 3 and position_ids.shape[0] == 4:
            text_position_ids = position_ids[0]
            position_ids = position_ids[1:]
        else:
            text_position_ids = position_ids[0]

        attention_mask = create_causal_mask(
            config=self.config,
            input_embeds=inputs_embeds,
            attention_mask=attention_mask,
            cache_position=cache_position,
            past_key_values=past_key_values,
            position_ids=text_position_ids,
        )

        hidden_states = inputs_embeds

        # create position embeddings to be shared across the decoder layers
        position_embeddings = self.rotary_emb(hidden_states, position_ids)

        # decoder layers
        for layer_idx, decoder_layer in enumerate(self.layers):
            layer_outputs = decoder_layer(
                hidden_states,
                attention_mask=attention_mask,
                position_ids=text_position_ids,
                past_key_values=past_key_values,
                cache_position=cache_position,
                position_embeddings=position_embeddings,
                **kwargs,
            )
            hidden_states = layer_outputs

        hidden_states = self.norm(hidden_states)

        return BaseModelOutputWithPast(
            last_hidden_state=hidden_states,
            past_key_values=past_key_values,
        )


@auto_docstring(
    custom_intro="""
    The Qwen3ASRThinker model which consists of a audio backbone and a language model.
    """
)
class Qwen3ASRThinkerForConditionalGeneration(Qwen3ASRPreTrainedModelForConditionalGeneration, GenerationMixin):
    config: Qwen3ASRThinkerConfig
    base_model_prefix = "thinker"
    _tied_weights_keys = ["model.embed_tokens.weight", "lm_head.weight"]
    _no_split_modules = [
        "Qwen3ASRAudioEncoderLayer",
        "Qwen3ASRThinkerTextDecoderLayer",
    ]
    _can_record_outputs = {
        "hidden_states": Qwen3ASRThinkerTextDecoderLayer,
        "attentions": Qwen3ASRThinkerTextAttention,
    }

    def __init__(self, config):
        super().__init__(config)
        self.audio_tower = Qwen3ASRAudioEncoder._from_config(config.audio_config)
        self.vocab_size = config.text_config.vocab_size
        self.model = Qwen3ASRThinkerTextModel._from_config(config.text_config)
        if "forced_aligner" in config.model_type:
            self.lm_head = nn.Linear(config.text_config.hidden_size, config.classify_num, bias=False)
        else:
            self.lm_head = nn.Linear(config.text_config.hidden_size, config.text_config.vocab_size, bias=False)
        self.pad_token_id = self.config.pad_token_id if self.config.pad_token_id is not None else -1
        self.rope_deltas = None
        self.post_init()

    def get_input_embeddings(self):
        return self.model.get_input_embeddings()

    def set_input_embeddings(self, value):
        self.model.set_input_embeddings(value)

    def get_audio_features(
        self,
        input_features: torch.FloatTensor,
        feature_attention_mask: Optional[torch.LongTensor] = None,
        audio_feature_lengths: Optional[torch.LongTensor] = None,
    ):
        """
        Encodes audios into continuous embeddings that can be forwarded to the language model.

        Args:
            input_features (`torch.FloatTensor`):
                The tensors corresponding to the input audios.
            feature_attention_mask (`torch.LongTensor`, *optional*):
                Mask to avoid performing attention on padding feature indices. Mask values selected in `[0, 1]`:
            audio_feature_lengths (`torch.LongTensor` of shape `(num_audios)`, *optional*):
                The length of feature shape of each audio in LLM.
        """
        if feature_attention_mask is not None:
            audio_feature_lengths = torch.sum(feature_attention_mask, dim=1)
        else:
            audio_feature_lengths = None
        feature_lens = audio_feature_lengths if audio_feature_lengths is not None else feature_attention_mask.sum(-1)
    
        # audio encoder do not support batch inference to keep precision
        audio_features = []
        for input_feature, feature_len in zip(input_features, feature_lens):
            audio_output = self.audio_tower(
                input_feature[:, :feature_len],
                feature_lens=feature_len.unsqueeze(0),
            )
            audio_feature = audio_output.last_hidden_state
            audio_features.append(audio_feature)
        audio_features = torch.cat(audio_features, dim=0)

        return audio_features

    def get_placeholder_mask(
        self,
        input_ids: torch.LongTensor,
        inputs_embeds: torch.FloatTensor,
    ):
        """
        Obtains multimodal placeholder mask from `input_ids` or `inputs_embeds`, and checks that the placeholder token count is
        equal to the length of multimodal features. If the lengths are different, an error is raised.
        """
        if input_ids is None:
            special_audio_mask = (
                inputs_embeds
                == self.get_input_embeddings()(
                    torch.tensor(self.config.audio_token_id, dtype=torch.long, device=inputs_embeds.device)
                )
            ).all(-1)
        else:
            special_audio_mask = input_ids == self.config.audio_token_id

        special_audio_mask = special_audio_mask.unsqueeze(-1).expand_as(inputs_embeds).to(inputs_embeds.device)
        return special_audio_mask

    @can_return_tuple
    @auto_docstring
    def forward(
        self,
        input_ids=None,
        input_features=None,
        attention_mask=None,
        feature_attention_mask=None,
        audio_feature_lengths=None,
        position_ids=None,
        past_key_values=None,
        inputs_embeds=None,
        rope_deltas=None,
        labels=None,
        use_cache=None,
        cache_position=None,
        **kwargs,
    ) -> Union[tuple, Qwen3ASRThinkerCausalLMOutputWithPast]:
        r"""
        feature_attention_mask (`torch.Tensor` of shape `(batch_size, feature_sequence_length)`, *optional*):
            Mask to avoid performing attention on padding feature indices. Mask values selected in `[0, 1]`:
            - 1 for tokens that are **not masked**,
            - 0 for tokens that are **masked**.
        audio_feature_lengths (`torch.LongTensor` of shape `(num_audios)`, *optional*):
            The length of feature shape of each audio in LLM.
        rope_deltas (`torch.LongTensor` of shape `(batch_size, )`, *optional*):
            The rope index difference between sequence length and multimodal rope.
        labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
            Labels for computing the masked language modeling loss. Indices should either be in `[0, ...,
            config.vocab_size]` or -100 (see `input_ids` docstring). Tokens with indices set to `-100` are ignored
            (masked), the loss is only computed for the tokens with labels in `[0, ..., config.vocab_size]`.
        """

        if inputs_embeds is None:
            # 1. Extract the input embeddings
            inputs_embeds = self.get_input_embeddings()(input_ids)

        # 2. Merge text, audios
        if input_features is not None:
            audio_features = self.get_audio_features(
                input_features,
                feature_attention_mask=feature_attention_mask,
                audio_feature_lengths=audio_feature_lengths,
            )
            audio_features = audio_features.to(inputs_embeds.device, inputs_embeds.dtype)
            audio_mask = self.get_placeholder_mask(input_ids, inputs_embeds=inputs_embeds)
            inputs_embeds = inputs_embeds.masked_scatter(audio_mask, audio_features)

        if feature_attention_mask is not None:
            audio_feature_lengths = torch.sum(feature_attention_mask, dim=1)
        else:
            audio_feature_lengths = None

        if attention_mask is not None and position_ids is None:
            if (
                cache_position is None
                or (cache_position is not None and cache_position[0] == 0)
                or self.rope_deltas is None
            ):
                delta0 = (1 - attention_mask).sum(dim=-1).unsqueeze(1)
                position_ids, rope_deltas = self.get_rope_index(
                    attention_mask,
                )
                rope_deltas = rope_deltas - delta0
                self.rope_deltas = rope_deltas
            else:
                batch_size, seq_length = input_ids.shape
                delta = cache_position[0] + self.rope_deltas if cache_position is not None else 0
                position_ids = torch.arange(seq_length, device=input_ids.device)
                position_ids = position_ids.view(1, -1).expand(batch_size, -1)
                position_ids = position_ids.add(delta)
                position_ids = position_ids.unsqueeze(0).expand(3, -1, -1)

        outputs = self.model(
            attention_mask=attention_mask,
            position_ids=position_ids,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            use_cache=use_cache,
            cache_position=cache_position,
            **kwargs,
        )

        hidden_states = outputs[0]
        logits = self.lm_head(hidden_states)

        loss = None
        if labels is not None:
            loss = self.loss_function(
                logits=logits, labels=labels, vocab_size=self.config.get_text_config().vocab_size
            )

        return Qwen3ASRThinkerCausalLMOutputWithPast(
            loss=loss,
            logits=logits,
            hidden_states=outputs.hidden_states,
            attentions=outputs.attentions,
            past_key_values=outputs.past_key_values,
            rope_deltas=self.rope_deltas,
        )

    def prepare_inputs_for_generation(
        self,
        input_ids,
        past_key_values=None,
        attention_mask=None,
        inputs_embeds=None,
        cache_position=None,
        position_ids=None,
        use_cache=True,
        input_features=None,
        feature_attention_mask=None,
        **kwargs,
    ):
        model_inputs = super().prepare_inputs_for_generation(
            input_ids,
            past_key_values=past_key_values,
            attention_mask=attention_mask,
            inputs_embeds=inputs_embeds,
            cache_position=cache_position,
            position_ids=position_ids,
            use_cache=use_cache,
            input_features=input_features,
            feature_attention_mask=feature_attention_mask,
            **kwargs,
        )

        model_inputs["position_ids"] = None

        if cache_position[0] != 0:
            model_inputs["input_features"] = None

        return model_inputs


@auto_docstring
class Qwen3ASRThinkerTextPreTrainedModel(PreTrainedModel):
    config = Qwen3ASRConfig
    base_model_prefix = "model"
    supports_gradient_checkpointing = True
    _no_split_modules = ["Qwen3ASRThinkerTextDecoderLayer"]
    _skip_keys_device_placement = ["past_key_values"]
    _supports_flash_attn = True
    _supports_sdpa = True
    _supports_flex_attn = True
    _can_compile_fullgraph = False  # MoE models don't work with torch.compile (`torch.where(condition)` not supported)
    _supports_attention_backend = True
    _can_record_outputs = {
        "hidden_states": Qwen3ASRThinkerTextDecoderLayer,
        "attentions": Qwen3ASRThinkerTextAttention,
    }
    config_class = Qwen3ASRConfig


class Qwen3ASRForConditionalGeneration(Qwen3ASRPreTrainedModel, GenerationMixin):
    config_class = Qwen3ASRConfig

    def __init__(self, config: Qwen3ASRConfig):
        super().__init__(config)
        self.config = config

        self.thinker = Qwen3ASRThinkerForConditionalGeneration._from_config(config.thinker_config)
        self.post_init()
    
    def get_support_languages(self):
        return self.config.support_languages

    @torch.no_grad()
    def generate(
        self,
        input_ids: Optional[torch.Tensor] = None,
        max_new_tokens: int = 4096,
        eos_token_id: int | list[int] = [151645, 151643],
        **kwargs,
    ):
        shared_kwargs = {}
        thinker_kwargs = {
            "max_new_tokens": max_new_tokens,
            "eos_token_id": eos_token_id,
        }

        for key, value in kwargs.items():
            # Process special input values
            if key == "feature_attention_mask":
                thinker_kwargs[key] = value
            elif key in ("input_features", "attention_mask"):
                thinker_kwargs[key] = value
            # Put other key to shared kwargs
            else:
                shared_kwargs[key] = value

        # Merge kwargs
        for key, value in shared_kwargs.items():
            if key not in thinker_kwargs:
                thinker_kwargs[key] = value

        thinker_result = self.thinker.generate(input_ids=input_ids, return_dict_in_generate=True, **thinker_kwargs)

        return thinker_result


__all__ = [
    "Qwen3ASRForConditionalGeneration",
    "Qwen3ASRThinkerTextModel",
    "Qwen3ASRThinkerForConditionalGeneration",
    "Qwen3ASRPreTrainedModel",
    "Qwen3ASRPreTrainedModelForConditionalGeneration",
    "Qwen3ASRThinkerTextPreTrainedModel",
]
