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src/task/inference/extract.py
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from pydoc import text
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import torch
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from src.task.model import TinyTransformerLM, TinyClassifier, TinyAnsweringModel
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class TextExtractor:
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def __init__(
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self,
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model: TinyAnsweringModel,
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tokenizer,
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context_length,
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device=None,
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):
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self.model = model
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self.tokenizer = tokenizer
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self.context_length = context_length
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if device is None:
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device = (
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"cuda"
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if torch.cuda.is_available()
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else "cpu"
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)
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self.device = torch.device(device)
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self.model.to(self.device)
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self.model.eval()
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@torch.no_grad()
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def extract(
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self,
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context_text: str, #context containing the answer
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question_text: str #the actual question
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):
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input_text = (
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self.tokenizer.CLS_TOKEN
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+ question_text
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+ self.tokenizer.SEP_TOKEN
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+ context_text
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+ self.tokenizer.SEP_TOKEN
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)
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input_ids = self.tokenizer.encode(input_text)
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padded_ids, mask_ids = self.tokenizer.pad(
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[input_ids],
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max_length=self.context_length
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)
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token_tensor = torch.tensor(
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padded_ids[0],
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dtype=torch.long
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)
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padding_mask = torch.tensor(
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mask_ids,
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dtype=torch.bool
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)
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#Typically -> embedding -> transformer -> start,end logits
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#Forward pass on the model is refusing :-(
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start_logits, end_logits = self.model(
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tokens=token_tensor.unsqueeze(0),
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padding_mask=padding_mask
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)
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# Remove batch dimension: [max_length]
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start_logits = start_logits[0]
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end_logits = end_logits[0]
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start_predictions = torch.argmax(
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start_logits,
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dim=-1,
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)
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end_predictions = torch.argmax(
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end_logits,
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dim=-1,
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)
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return token_tensor, start_predictions.item(), end_predictions.item()
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