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| from transformers import AutoTokenizer, AutoModelForSequenceClassification | |
| from transformers import pipeline as hf_pipeline | |
| from pathlib import Path | |
| from typing import Any, Dict | |
| from .app_logger import get_logger | |
| class NpcBertCLS(): | |
| r"""A class for performing report classification with BERT. | |
| This class facilitates report classification tasks using a BERT model | |
| fine-tuned on NPC staging reports. The base model is an uncased model | |
| released by Microsoft, which can be found on the Hugging Face model hub | |
| under the name 'microsoft/BiomedNLP-PubMedBERT-base-uncased-abstract-fulltext'. | |
| Attributes: | |
| model (transformers.PreTrainedModel): | |
| The fine-tuned BERT model for sequence classification. | |
| tokenizer (transformers.PreTrainedTokenizer): | |
| The tokenizer for the BERT model. | |
| pipeline (transformers.text-classification): | |
| The Hugging Face text-classification pipeline. | |
| pretrained_model (str): | |
| The path to the directory containing the fine-tuned model. | |
| """ | |
| logger = get_logger() | |
| def __init__(self): | |
| self.model = None | |
| self.tokenizer = None | |
| self.pipeline = None | |
| # relative to app.py | |
| self.pretrained_model = "./models/npc-bert-cls" | |
| self.logger.info(f"Created {__class__.__name__} instance.") | |
| def load(self) -> None: | |
| """Loads the fine-tuned BERT model and related components. | |
| This method initializes the model, tokenizer, and pipeline for the | |
| text classification tasks using the pre-trained weights from the | |
| specified directory. | |
| Raises: | |
| FileNotFoundError: If the pretrained model directory is not found. | |
| """ | |
| if not Path(self.pretrained_model).is_dir(): | |
| raise FileNotFoundError(f"Cannot found pretrained model at: {self.pretrained_model}") | |
| self.model = AutoModelForSequenceClassification.from_pretrained(self.pretrained_model) | |
| self.tokenizer = AutoTokenizer.from_pretrained(self.pretrained_model) | |
| self.pipeline = hf_pipeline("text-classification", model=self.model, tokenizer=self.tokenizer, device='cpu') | |
| def __call__(self, *args: Any) -> Any: | |
| """Performs classification on the given reports. | |
| This method should be called only after the `load` method has been executed | |
| to ensure that the model and pipeline are properly initialized. It accepts | |
| arguments to pass to the Hugging Face text-classification pipeline. | |
| Args: | |
| *args: Variable length argument list to pass to the pipeline. | |
| Returns: | |
| The output of the text-classification pipeline. | |
| Raises: | |
| BrokenPipeError: If the model has not been loaded before calling this method. | |
| """ | |
| self.logger.info(f"Called with {args = }") | |
| if self.pipeline is None: | |
| msg = "Model was not initialized, have you run load()?" | |
| raise BrokenPipeError(msg) | |
| # check length of text | |
| if len(args[0]) < 10: | |
| return "Not enough text for classification!" | |
| pipe_out = self.pipeline(*args) | |
| pipe_out = {o['label']: o['score'] for o in pipe_out} | |
| return pipe_out | |