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chore: import upstream snapshot with attribution
2026-07-13 12:38:16 +08:00

734 lines
27 KiB
Python

# Copyright 2025 Qwen Team
# Copyright 2025 SGLang Team
# 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.
# ==============================================================================
"""Inference-only Qwen3-VL model compatible with HuggingFace weights."""
import math
from typing import Iterable, List, Optional, Tuple
import numpy as np
import torch
import torch.nn as nn
import torch.nn.functional as F
from transformers import PreTrainedModel
from transformers.activations import ACT2FN
from transformers.modeling_outputs import BaseModelOutput
from sglang.srt.configs.qwen3_omni import (
Qwen3OmniMoeAudioEncoderConfig,
Qwen3OmniMoeThinkerConfig,
Qwen3OmniMoeVisionEncoderConfig,
)
from sglang.srt.configs.qwen3_vl import Qwen3VLMoeConfig
from sglang.srt.layers.attention.vision import VisionAttention
from sglang.srt.layers.linear import (
ColumnParallelLinear,
ReplicatedLinear,
RowParallelLinear,
)
from sglang.srt.layers.moe.fused_moe_triton.layer import FusedMoE
from sglang.srt.layers.quantization.base_config import QuantizationConfig
from sglang.srt.managers.schedule_batch import MultimodalDataItem
from sglang.srt.model_loader.weight_utils import default_weight_loader
from sglang.srt.models.qwen3_vl import Qwen3VLMoeVisionModel
from sglang.srt.models.qwen3_vl_moe import (
Qwen3MoeLLMModel,
Qwen3VLMoeForConditionalGeneration,
load_fused_expert_weights,
)
from sglang.srt.runtime_context import get_parallel
from sglang.srt.utils import add_prefix, is_cpu, is_npu, logger
_is_cpu = is_cpu()
def get_head_dim_and_projection_size(
embed_dim: int,
num_heads: int,
original_num_heads: Optional[int] = None,
) -> Tuple[Optional[int], int]:
if (not _is_cpu) or original_num_heads is None:
return None, embed_dim
# On CPU, TP may pad num_heads (e.g. for tp=3/6). In that case we keep the
# original per-head width (from original_num_heads) and recompute projection_size
# with padded num_heads, so attention tensor shapes stay TP-friendly while
# preserving checkpoint semantics.
head_dim = embed_dim // original_num_heads
projection_size = num_heads * head_dim
return head_dim, projection_size
class Qwen3OmniMoeAudioEncoderLayer(nn.Module):
def __init__(
self,
config: Qwen3OmniMoeAudioEncoderConfig,
quant_config: Optional[QuantizationConfig] = None,
prefix: str = "",
):
super().__init__()
embed_dim = config.d_model
self.embed_dim = config.d_model
head_dim, projection_size = get_head_dim_and_projection_size(
embed_dim=embed_dim,
num_heads=config.encoder_attention_heads,
original_num_heads=getattr(
config, "original_encoder_attention_heads", None
),
)
self.self_attn = VisionAttention(
embed_dim=embed_dim,
num_heads=config.encoder_attention_heads,
head_dim=head_dim,
projection_size=projection_size,
use_qkv_parallel=True,
proj_bias=True,
flatten_batch=True,
quant_config=quant_config,
prefix=add_prefix("attn", prefix),
)
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
tp_size = get_parallel().tp_size
use_replicated = config.encoder_ffn_dim % tp_size != 0
fc1_cls = ReplicatedLinear if use_replicated else ColumnParallelLinear
fc2_cls = ReplicatedLinear if use_replicated else RowParallelLinear
self.fc1 = fc1_cls(
self.embed_dim,
config.encoder_ffn_dim,
quant_config=quant_config,
bias=True,
prefix=f"{prefix}.fc1",
)
self.fc2 = fc2_cls(
config.encoder_ffn_dim,
self.embed_dim,
quant_config=quant_config,
bias=True,
prefix=f"{prefix}.fc2",
)
self.final_layer_norm = nn.LayerNorm(self.embed_dim)
def forward(
self,
hidden_states: torch.Tensor,
cu_seqlens: torch.Tensor,
**kwargs,
) -> torch.Tensor:
"""
Args:
hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)`
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(
x=hidden_states,
cu_seqlens=cu_seqlens,
)
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, :]
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 Qwen3OmniMoeAudioEncoder(PreTrainedModel):
config: Qwen3OmniMoeAudioEncoderConfig
def __init__(self, config: Qwen3OmniMoeAudioEncoderConfig, quant_config=None):
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(
[
Qwen3OmniMoeAudioEncoderLayer(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,
)
conv_out_dim = config.downsample_hidden_size * (
(((config.num_mel_bins + 1) // 2 + 1) // 2 + 1) // 2
)
self.conv_out = ReplicatedLinear(
conv_out_dim,
config.d_model,
bias=False,
quant_config=quant_config,
)
self.proj1 = ReplicatedLinear(
config.d_model, config.d_model, quant_config=quant_config
)
self.act = ACT2FN[config.activation_function]
self.proj2 = ReplicatedLinear(
config.d_model, config.output_dim, quant_config=quant_config
)
self.n_window_infer = self.config.n_window_infer
self.conv_chunksize = self.config.conv_chunksize
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 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)
# Introduce vectorized mask to avoid many small tensors
feature_lens_after_cnn = _get_feat_extract_output_lengths(chunk_lengths)
max_len_after_cnn = (
int(feature_lens_after_cnn.max().item())
if feature_lens_after_cnn.numel()
else 0
)
idx = torch.arange(max_len_after_cnn, device=padded_feature.device)
padded_mask_after_cnn = idx.unsqueeze(0) < feature_lens_after_cnn.unsqueeze(1)
padded_feature = padded_feature.unsqueeze(1)
# Add fast path + chunk normal path
if padded_feature.size(0) <= self.conv_chunksize:
padded_embed = F.gelu(self.conv2d1(padded_feature))
padded_embed = F.gelu(self.conv2d2(padded_embed))
padded_embed = F.gelu(self.conv2d3(padded_embed))
else:
padded_embeds = []
for chunk in padded_feature.split(self.conv_chunksize, dim=0):
x = F.gelu(self.conv2d1(chunk))
x = F.gelu(self.conv2d2(x))
x = F.gelu(self.conv2d3(x))
padded_embeds.append(x)
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)
)[0]
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)
)
# Use tolist() for efficient batch conversion from tensor to Python
for cnn_len in aftercnn_lens.tolist():
num_full_chunks = cnn_len // window_aftercnn
remainder = cnn_len % window_aftercnn
cu_chunk_lens.extend([window_aftercnn] * num_full_chunks)
if remainder:
cu_chunk_lens.append(remainder)
cu_seqlens = torch.tensor(cu_chunk_lens, device=aftercnn_lens.device).cumsum(
-1, dtype=torch.int32
)
# cu_seqlens must be on cpu because of npu_flash_attention_unpad operator restriction
if is_npu():
cu_seqlens = cu_seqlens.to("cpu")
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)[0]
hidden_states = self.act(hidden_states)
hidden_states = self.proj2(hidden_states)[0]
return BaseModelOutput(last_hidden_state=hidden_states)
# Ignore copy
def _get_feat_extract_output_lengths(self, input_lengths: torch.LongTensor):
"""
Computes the output length of the convolutional layers and the output length of the audio encoder
"""
input_lengths = (input_lengths - 1) // 2 + 1
output_lengths = (input_lengths - 2) // 2 + 1
return input_lengths, output_lengths
class Qwen3OmniMoeVisionPatchMerger(nn.Module):
def __init__(
self,
dim: int,
context_dim: int,
spatial_merge_size: int = 2,
quant_config: Optional[QuantizationConfig] = None,
prefix: str = "",
use_postshuffle_norm=False,
) -> None:
super().__init__()
self.hidden_size = context_dim * (spatial_merge_size**2)
self.use_postshuffle_norm = use_postshuffle_norm
self.ln_q = nn.LayerNorm(
self.hidden_size if use_postshuffle_norm else context_dim, eps=1e-6
)
self.mlp = nn.ModuleList(
[
ColumnParallelLinear(
self.hidden_size,
self.hidden_size,
bias=True,
quant_config=quant_config,
prefix=add_prefix("mlp.0", prefix),
),
nn.GELU(),
RowParallelLinear(
self.hidden_size,
dim,
bias=True,
quant_config=quant_config,
prefix=add_prefix("mlp.2", prefix),
),
]
)
def forward(self, x: torch.Tensor) -> torch.Tensor:
x = (
x.view(-1, self.hidden_size)
if self.use_postshuffle_norm
else x.view(-1, x.shape[-1])
)
hidden = self.ln_q(x).view(-1, self.hidden_size)
for layer in self.mlp:
if isinstance(hidden, tuple):
hidden = hidden[0]
hidden = layer(hidden)
if isinstance(hidden, tuple):
hidden = hidden[0]
return hidden
class Qwen3OmniMoeVisionEncoder(Qwen3VLMoeVisionModel):
config: Qwen3OmniMoeVisionEncoderConfig
def __init__(
self,
config: Qwen3OmniMoeVisionEncoderConfig,
quant_config: Optional[QuantizationConfig] = None,
prefix: str = None,
**kwargs,
):
super().__init__(
vision_config=config,
quant_config=quant_config,
norm_eps=getattr(config, "rms_norm_eps", 1e-6),
)
self.merger = Qwen3OmniMoeVisionPatchMerger(
dim=config.out_hidden_size,
context_dim=config.hidden_size,
spatial_merge_size=config.spatial_merge_size,
quant_config=quant_config,
use_postshuffle_norm=False,
prefix=add_prefix("merger", prefix),
)
self.merger_list = nn.ModuleList(
[
Qwen3OmniMoeVisionPatchMerger(
dim=config.out_hidden_size,
context_dim=config.hidden_size,
spatial_merge_size=config.spatial_merge_size,
use_postshuffle_norm=True,
quant_config=quant_config,
prefix=add_prefix("merger_list", prefix),
)
for _ in range(len(config.deepstack_visual_indexes))
]
)
del self.deepstack_merger_list
@property
def deepstack_merger_list(self):
return self.merger_list
@property
def dtype(self) -> torch.dtype:
return self.patch_embed.proj.weight.dtype
@property
def device(self) -> torch.device:
return self.patch_embed.proj.weight.device
class Qwen3OmniMoeThinkerForConditionalGeneration(Qwen3VLMoeForConditionalGeneration):
config: Qwen3OmniMoeThinkerConfig
def __init__(
self,
config: Qwen3OmniMoeThinkerConfig,
quant_config: Optional[QuantizationConfig] = None,
prefix: str = "",
):
super().__init__(
config, quant_config, prefix, language_model_cls=Qwen3MoeLLMModel
)
self.audio_tower = Qwen3OmniMoeAudioEncoder(config.audio_config, quant_config)
self.visual = Qwen3OmniMoeVisionEncoder(
config.vision_config,
quant_config=quant_config,
norm_eps=getattr(config, "rms_norm_eps", 1e-6),
prefix=add_prefix("visual", prefix),
)
self.pad_token_id = (
self.config.pad_token_id if self.config.pad_token_id is not None else -1
)
def get_audio_feature(self, items: List[MultimodalDataItem]):
device = next(self.audio_tower.parameters()).device
feature_attention_mask = (
torch.cat([item.feature_attention_mask for item in items], dim=0)
.type(torch.long)
.to(device)
)
input_features = (
torch.cat([item.feature for item in items])
.type(self.audio_tower.dtype)
.to(next(self.audio_tower.parameters()).device)
)
if feature_attention_mask is not None:
audio_feature_lengths = torch.sum(feature_attention_mask, dim=1)
input_features = input_features.permute(0, 2, 1)[
feature_attention_mask.bool()
].permute(1, 0)
else:
audio_feature_lengths = None
feature_lens = (
audio_feature_lengths
if audio_feature_lengths is not None
else feature_attention_mask.sum(-1)
)
audio_outputs = self.audio_tower(
input_features,
feature_lens=feature_lens,
)
audio_features = audio_outputs.last_hidden_state
return audio_features
class Qwen3OmniMoeForConditionalGeneration(PreTrainedModel):
def __init__(
self,
config: Qwen3VLMoeConfig,
quant_config: Optional[QuantizationConfig] = None,
prefix: str = "",
):
super().__init__(config)
self.config = config
self.thinker = Qwen3OmniMoeThinkerForConditionalGeneration(
config.thinker_config, quant_config=quant_config, prefix=prefix
)
self.enable_talker = False
self.pad_input_ids = self.thinker.pad_input_ids
self.forward = self.thinker.forward
def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
stacked_params_mapping = [
# (param_name, shard_name, shard_id)
(".qkv_proj", ".q_proj", "q"),
(".qkv_proj", ".k_proj", "k"),
(".qkv_proj", ".v_proj", "v"),
("gate_up_proj", "up_proj", 1),
("gate_up_proj", "gate_proj", 0),
]
expert_params_mapping = FusedMoE.make_expert_params_mapping(
ckpt_gate_proj_name="gate_proj",
ckpt_down_proj_name="down_proj",
ckpt_up_proj_name="up_proj",
num_experts=self.config.num_experts,
)
# Skip loading extra parameters for GPTQ/modelopt models.
ignore_suffixes = (
".bias",
"_bias",
".k_scale",
"_k_scale",
".v_scale",
"_v_scale",
".weight_scale",
"_weight_scale",
".input_scale",
"_input_scale",
)
is_fused_expert = False
fused_expert_params_mapping = [
("experts.w13_weight", "experts.gate_up_proj", 0, "w1"),
("experts.w2_weight", "experts.down_proj", 0, "w2"),
]
num_experts = self.config.num_experts
# Pre-define `params_dict` to avoid repeated expensive traversal of model parameters.
params_dict = dict(self.named_parameters())
for name, loaded_weight in weights:
name = name.replace(r"model.language_model.", r"model.")
if ("talker" in name or "code2wav" in name) and not self.enable_talker:
continue
name = name.replace(".self_attn.out_proj", ".self_attn.proj")
for param_name, weight_name, shard_id in stacked_params_mapping:
if "experts.gate_up_proj" in name or "experts.down_proj" in name:
is_fused_expert = True
expert_params_mapping = fused_expert_params_mapping
# Skip non-stacked layers and experts (experts handled below).
if weight_name not in name:
continue
if "visual" in name:
continue
# We have mlp.experts[0].gate_proj in the checkpoint.
# Since we handle the experts below in expert_params_mapping,
# we need to skip here BEFORE we update the name, otherwise
# name will be updated to mlp.experts[0].gate_up_proj, which
# will then be updated below in expert_params_mapping
# for mlp.experts[0].gate_gate_up_proj, which breaks load.
if "mlp.experts" in name:
continue
name = name.replace(weight_name, param_name)
# Skip loading extra parameters for GPTQ/modelopt models.
if name.endswith(ignore_suffixes) and name not in params_dict:
continue
# [TODO] Skip layers that are on other devices (check if sglang has a similar function)
# if is_pp_missing_parameter(name, self):
# continue
if name not in params_dict:
continue
param = params_dict[name]
weight_loader = param.weight_loader
weight_loader(param, loaded_weight, shard_id)
break
else:
# Track if this is an expert weight to enable early skipping
is_expert_weight = False
for mapping in expert_params_mapping:
param_name, weight_name, expert_id, shard_id = mapping
if weight_name not in name:
continue
if "visual" in name or "audio_tower" in name:
continue
# Anyway, this is an expert weight and should not be
# attempted to load as other weights later
is_expert_weight = True
name_mapped = name.replace(weight_name, param_name)
if is_fused_expert:
loaded_weight = loaded_weight.transpose(-1, -2) # no bias
if "experts.gate_up_proj" in name:
loaded_weight = loaded_weight.chunk(2, dim=-2)
load_fused_expert_weights(
name_mapped,
params_dict,
loaded_weight[0],
"w1",
num_experts,
)
load_fused_expert_weights(
name_mapped,
params_dict,
loaded_weight[1],
"w3",
num_experts,
)
else:
load_fused_expert_weights(
name_mapped,
params_dict,
loaded_weight,
shard_id,
num_experts,
)
else:
# Skip loading extra parameters for GPTQ/modelopt models.
if (
name_mapped.endswith(ignore_suffixes)
and name_mapped not in params_dict
):
continue
if name_mapped in params_dict.keys():
param = params_dict[name_mapped]
else:
continue
# We should ask the weight loader to return success or
# not here since otherwise we may skip experts with
# # other available replicas.
weight_loader = param.weight_loader
weight_loader(
param,
loaded_weight,
name_mapped,
shard_id=shard_id,
expert_id=expert_id,
)
name = name_mapped
break
else:
if is_expert_weight:
# This is an expert weight but not mapped to this rank, skip all remaining processing
continue
if "visual" in name or "audio_tower" in name:
# adapt to VisionAttention
name = name.replace(r"attn.qkv.", r"attn.qkv_proj.")
name = name.replace(r"model.visual.", r"visual.")
name = name.replace(r"attn.out_proj.", r"attn.proj.")
# Skip loading extra parameters for GPTQ/modelopt models.
if name.endswith(ignore_suffixes) and name not in params_dict:
continue
if name in params_dict.keys():
param = params_dict[name]
weight_loader = getattr(
param, "weight_loader", default_weight_loader
)
weight_loader(param, loaded_weight)
else:
logger.warning(
f"Loaded weight with {name=} not found in params_dict"
)
EntryClass = Qwen3OmniMoeForConditionalGeneration