38 lines
1.5 KiB
Python
38 lines
1.5 KiB
Python
from torch import Tensor, nn
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from transformers import (CLIPTextModel, CLIPTokenizer, T5EncoderModel,
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T5Tokenizer)
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class HFEmbedder(nn.Module):
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def __init__(self, version: str, max_length: int, is_clip: bool, **hf_kwargs):
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super().__init__()
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self.is_clip = is_clip
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self.max_length = max_length
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self.output_key = "pooler_output" if self.is_clip else "last_hidden_state"
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if self.is_clip:
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self.tokenizer: CLIPTokenizer = CLIPTokenizer.from_pretrained(version, max_length=max_length)
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self.hf_module: CLIPTextModel = CLIPTextModel.from_pretrained(version, **hf_kwargs)
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else:
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self.tokenizer: T5Tokenizer = T5Tokenizer.from_pretrained(version, max_length=max_length)
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self.hf_module: T5EncoderModel = T5EncoderModel.from_pretrained(version, **hf_kwargs)
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self.hf_module = self.hf_module.eval().requires_grad_(False)
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def forward(self, text) -> Tensor:
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batch_encoding = self.tokenizer(
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text,
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truncation=True,
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max_length=self.max_length,
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return_length=False,
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return_overflowing_tokens=False,
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padding="max_length",
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return_tensors="pt",
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)
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outputs = self.hf_module(
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input_ids=batch_encoding["input_ids"].to(self.hf_module.device),
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attention_mask=None,
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output_hidden_states=False,
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)
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return outputs[self.output_key] |