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| from transformers import pipeline | |
| import torch | |
| import random | |
| from masking_methods import MaskingProcessor | |
| class SamplingProcessorWithPipeline: | |
| def __init__(self, model_name='bert-base-uncased'): | |
| self.unmasker = pipeline('fill-mask', model=model_name) | |
| self.tokenizer = self.unmasker.tokenizer | |
| def fill_masked_sentence(self, masked_sentence, sampling_technique, temperature=1.0): | |
| """ | |
| Fills each mask in the masked sentence using the specified sampling technique. | |
| Args: | |
| masked_sentence (str): Sentence with [MASK] tokens. | |
| sampling_technique (str): Sampling technique to use (e.g., "inverse_transform", "exponential_minimum", "temperature", "greedy"). | |
| temperature (float): Temperature parameter for sampling methods. | |
| Returns: | |
| str: Sentence with the masks filled. | |
| """ | |
| while '[MASK]' in masked_sentence: | |
| # Get predictions for the first [MASK] | |
| predictions = self.unmasker(masked_sentence) | |
| print(f' predictions : {predictions}') | |
| print(f' type of predictions : {type(predictions)}') | |
| # Ensure predictions is a list of dictionaries | |
| if not isinstance(predictions, list) or not all(isinstance(pred, dict) for pred in predictions): | |
| raise ValueError("Unexpected structure in predictions from the pipeline.") | |
| # Extract logits (scores) from the predictions | |
| logits = torch.tensor([pred['score'] for pred in predictions], dtype=torch.float32) | |
| if sampling_technique == "inverse_transform": | |
| probs = torch.softmax(logits / temperature, dim=-1) | |
| cumulative_probs = torch.cumsum(probs, dim=-1) | |
| random_prob = random.random() | |
| sampled_index = torch.where(cumulative_probs >= random_prob)[0][0].item() | |
| elif sampling_technique == "exponential_minimum": | |
| probs = torch.softmax(logits / temperature, dim=-1) | |
| exp_probs = torch.exp(-torch.log(probs)) | |
| random_probs = torch.rand_like(exp_probs) | |
| sampled_index = torch.argmax(random_probs * exp_probs).item() | |
| elif sampling_technique == "temperature": | |
| logits = torch.clamp(logits, min=-1e8, max=1e8) | |
| probs = torch.softmax(logits / temperature, dim=-1) | |
| if torch.any(torch.isnan(probs)) or torch.any(torch.isinf(probs)): | |
| raise ValueError("The computed probabilities contain NaN or inf values.") | |
| probs = torch.max(probs, torch.tensor(1e-8, device=logits.device)) | |
| probs = probs / torch.sum(probs) | |
| probs = probs.flatten() | |
| if probs.size(0) > 1: | |
| sampled_index = torch.multinomial(probs, 1).item() | |
| else: | |
| sampled_index = torch.argmax(probs).item() | |
| elif sampling_technique == 'greedy': | |
| sampled_index = torch.argmax(logits).item() | |
| else: | |
| raise ValueError(f"Unknown sampling technique: {sampling_technique}") | |
| # Replace the first [MASK] with the selected word | |
| sampled_token = predictions[sampled_index]['token_str'] | |
| masked_sentence = masked_sentence.replace('[MASK]', sampled_token, 1) | |
| return masked_sentence | |
| # Example usage | |
| if __name__ == "__main__": | |
| from transformers import BertTokenizer | |
| # Define sentences and result_dict | |
| sentences = [ | |
| "The quick brown fox jumps over the lazy dog.", | |
| "A quick brown dog outpaces a lazy fox.", | |
| "Quick brown dog leaps over lazy the fox." | |
| ] | |
| result_dict = { | |
| "The quick brown fox jumps over the lazy dog.": {'quick brown': [(0, 1)], 'fox': [(2, 2)], 'lazy': [(4, 4)], 'dog': [(5, 5)]}, | |
| "A quick brown dog outpaces a lazy fox.": {'quick brown': [(0, 1)], 'fox': [(5, 5)], 'lazy': [(4, 4)], 'dog': [(2, 2)]}, | |
| "Quick brown dog leaps over lazy the fox.": {'quick brown': [(0, 1)], 'fox': [(5, 5)], 'lazy': [(4, 4)], 'dog': [(2, 2)]} | |
| } | |
| masking_processor = MaskingProcessor() | |
| masking_results = masking_processor.process_sentences(sentences, result_dict, method="random", remove_stopwords=False) | |
| # Use SamplingProcessor | |
| sampling_processor = SamplingProcessorWithPipeline() | |
| # Iterate through masking results to apply sampling | |
| for sentence, result in masking_results.items(): | |
| print(f"Original Sentence (Random): {sentence}") | |
| print(f"Masked Sentence (Random): {result['masked_sentence']}") | |
| masked_sentence = result["masked_sentence"] | |
| # Apply different sampling techniques | |
| for technique in ["inverse_transform", "exponential_minimum", "temperature", "greedy"]: | |
| print(f"Sampling Technique: {technique}") | |
| filled_sentence = sampling_processor.fill_masked_sentence( | |
| masked_sentence=masked_sentence, | |
| sampling_technique=technique, | |
| temperature=1.0 # Adjust temperature as needed | |
| ) | |
| print(f"Filled Sentence: {filled_sentence}\n") | |
| print('--------------------------------') | |