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from transformers import CLIPTokenizer, CLIPImageProcessor, CLIPTextModel, CLIPPreTrainedModel, CLIPTextConfig
from transformers.models.clip.modeling_clip import CLIPTextEmbeddings, CLIPEncoder, CLIPAttention, CLIPMLP, CLIPEncoderLayer, _create_4d_causal_attention_mask, _prepare_4d_attention_mask, BaseModelOutputWithPooling, CLIPTextModelOutput
from typing import Optional, Union, Tuple
import torch
from torch import nn
class CustomCLIPTokenizer(CLIPTokenizer):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Inherit everything from the original tokenizer
# No additional initialization needed unless you want to add specific features
class CustomCLIPImageProcessor(CLIPImageProcessor):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Inherit everything from the original processor
# No additional initialization needed unless you want to add specific features
class CustomCLIPTextTransformer(nn.Module):
def __init__(self, config):
super().__init__()
self.config = config
embed_dim = config.hidden_size
self.embeddings = CLIPTextEmbeddings(config)
self.encoder = CLIPEncoder(config)
self.final_layer_norm = nn.LayerNorm(embed_dim, eps=config.layer_norm_eps)
# For `pooled_output` computation
self.eos_token_id = config.eos_token_id
def forward(
self,
input_ids: Optional[torch.Tensor] = None,
attention_mask: Optional[torch.Tensor] = None,
position_ids: Optional[torch.Tensor] = None,
inputs_embeds: Optional[torch.FloatTensor] = None,
output_attentions: Optional[bool] = None,
output_hidden_states: Optional[bool] = None,
return_dict: Optional[bool] = None,
) -> Union[Tuple, BaseModelOutputWithPooling]:
output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
output_hidden_states = (
output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
)
return_dict = return_dict if return_dict is not None else self.config.use_return_dict
if input_ids is not None and inputs_embeds is not None:
raise ValueError("You cannot specify both input_ids and inputs_embeds at the same time")
if input_ids is None and inputs_embeds is None:
raise ValueError("You must provide either input_ids or inputs_embeds")
if inputs_embeds is not None:
# inputs_embeds are already embeddings, just add positional embeddings
inputs_embeds = self.embeddings.position_embedding(self.embeddings.position_ids[:, :inputs_embeds.size(1)]) + inputs_embeds
else:
inputs_embeds = self.embeddings(input_ids=input_ids, position_ids=position_ids)
# CLIP's text model uses causal mask, prepare it here.
causal_attention_mask = _create_4d_causal_attention_mask(
inputs_embeds.size()[:-1], inputs_embeds.dtype, device=inputs_embeds.device
)
# expand attention_mask
if attention_mask is not None:
# [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len]
attention_mask = _prepare_4d_attention_mask(attention_mask, inputs_embeds.dtype)
encoder_outputs = self.encoder(
inputs_embeds=inputs_embeds,
attention_mask=attention_mask,
causal_attention_mask=causal_attention_mask,
output_attentions=output_attentions,
output_hidden_states=output_hidden_states,
return_dict=return_dict,
)
last_hidden_state = encoder_outputs[0]
last_hidden_state = self.final_layer_norm(last_hidden_state)
# Update the pooled output computation to work with both input types
if input_ids is not None:
# Use input_ids to find the EOS token position
if self.eos_token_id == 2:
pooled_output = last_hidden_state[
torch.arange(last_hidden_state.shape[0], device=last_hidden_state.device),
input_ids.to(dtype=torch.int, device=last_hidden_state.device).argmax(dim=-1),
]
else:
pooled_output = last_hidden_state[
torch.arange(last_hidden_state.shape[0], device=last_hidden_state.device),
(input_ids.to(dtype=torch.int, device=last_hidden_state.device) == self.eos_token_id)
.int()
.argmax(dim=-1),
]
else:
# When using inputs_embeds, use the last token as the pooled output
pooled_output = last_hidden_state[:, -1]
if not return_dict:
return (last_hidden_state, pooled_output) + encoder_outputs[1:]
return BaseModelOutputWithPooling(
last_hidden_state=last_hidden_state,
pooler_output=pooled_output,
hidden_states=encoder_outputs.hidden_states,
attentions=encoder_outputs.attentions,
)
class CustomCLIPTextModel(CLIPPreTrainedModel):
config_class = CLIPTextConfig
_no_split_modules = ["CLIPTextEmbeddings", "CLIPEncoderLayer"]
def __init__(self, config: CLIPTextConfig):
super().__init__(config)
self.text_model = CustomCLIPTextTransformer(config)
# Initialize weights and apply final processing
self.post_init()
def get_input_embeddings(self) -> nn.Module:
return self.text_model.embeddings.token_embedding
def set_input_embeddings(self, value):
self.text_model.embeddings.token_embedding = value
def forward(
self,
input_ids: Optional[torch.Tensor] = None,
attention_mask: Optional[torch.Tensor] = None,
position_ids: Optional[torch.Tensor] = None,
inputs_embeds: Optional[torch.FloatTensor] = None,
output_attentions: Optional[bool] = None,
output_hidden_states: Optional[bool] = None,
return_dict: Optional[bool] = None,
) -> Union[Tuple, BaseModelOutputWithPooling]:
return self.text_model(
input_ids=input_ids,
attention_mask=attention_mask,
position_ids=position_ids,
inputs_embeds=inputs_embeds,
output_attentions=output_attentions,
output_hidden_states=output_hidden_states,
return_dict=return_dict,
)
class CustomCLIPTextModelWithProjection(CLIPPreTrainedModel):
config_class = CLIPTextConfig
_no_split_modules = ["CLIPTextEmbeddings", "CLIPEncoderLayer"]
def __init__(self, config: CLIPTextConfig):
super().__init__(config)
self.text_model = CustomCLIPTextTransformer(config)
# Add the projection layer for SDXL's second text encoder
projection_dim = getattr(config, 'projection_dim', config.hidden_size)
self.text_projection = nn.Linear(config.hidden_size, projection_dim, bias=False)
# Initialize weights and apply final processing
self.post_init()
def get_input_embeddings(self) -> nn.Module:
return self.text_model.embeddings.token_embedding
def set_input_embeddings(self, value):
self.text_model.embeddings.token_embedding = value
def forward(
self,
input_ids: Optional[torch.Tensor] = None,
attention_mask: Optional[torch.Tensor] = None,
position_ids: Optional[torch.Tensor] = None,
inputs_embeds: Optional[torch.FloatTensor] = None,
output_attentions: Optional[bool] = None,
output_hidden_states: Optional[bool] = None,
return_dict: Optional[bool] = None,
) -> Union[Tuple, CLIPTextModelOutput]:
text_outputs = self.text_model(
input_ids=input_ids,
attention_mask=attention_mask,
position_ids=position_ids,
inputs_embeds=inputs_embeds,
output_attentions=output_attentions,
output_hidden_states=output_hidden_states,
return_dict=return_dict,
)
pooled_output = text_outputs[1] if not return_dict else text_outputs.pooler_output
# Apply the projection to the pooled output
text_embeds = self.text_projection(pooled_output)
if not return_dict:
# Include both last_hidden_state, pooler_output, text_embeds, and other outputs
return (text_outputs[0], text_outputs[1], text_embeds) + text_outputs[2:]
return CLIPTextModelOutput(
text_embeds=text_embeds, # Projected embeddings (for similarity)
last_hidden_state=text_outputs.last_hidden_state, # All token representations
hidden_states=text_outputs.hidden_states,
attentions=text_outputs.attentions,
)
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