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18 lines
718 B
Python
18 lines
718 B
Python
# Copyright (c) Sebastian Raschka under Apache License 2.0 (see LICENSE.txt).
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# Source for "Build a Large Language Model From Scratch"
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# - https://www.manning.com/books/build-a-large-language-model-from-scratch
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# Code: https://github.com/rasbt/LLMs-from-scratch
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# Additional utility and helper functions for text generation not covered
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# in the main chapters
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def trim_input_tensor(input_ids_tensor, context_len, max_new_tokens):
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assert max_new_tokens < context_len
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keep_len = max(1, context_len - max_new_tokens)
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# If the prompt is too long, left-truncate to keep_len
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if input_ids_tensor.shape[1] > keep_len:
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input_ids_tensor = input_ids_tensor[:, -keep_len:]
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return input_ids_tensor
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