bert_paper_classifier.py

from transformers import Pipeline
from collections.abc import Iterable
import torch

class SciBertPaperClassifierPipeline(Pipeline):
    def _sanitize_parameters(self, **kwargs):
        return {}, {}, {}

    def preprocess(self, inputs):
        if not isinstance(inputs, Iterable):
            inputs = [inputs]
        texts = [
            f"AUTHORS: {' '.join(paper.authors) if isinstance(paper.authors, list) else paper.authors} "
            f"TITLE: {paper.title} ABSTRACT: {paper.abstract}"
            for paper in inputs
        ]
        inputs = self.tokenizer(
            texts, truncation=True, padding=True, max_length=256, return_tensors="pt"
        ).to(self.device)
        return inputs

    def _forward(self, model_inputs):
        with torch.no_grad():
            outputs = self.model(**model_inputs)
        return outputs

    def postprocess(self, model_outputs):
        probs = torch.nn.functional.softmax(model_outputs.logits, dim=-1)
        results = []
        for prob in probs:
            result = [
                {self.model.config.id2label[label_idx]: score.item()}
                for label_idx, score in enumerate(prob)
            ]
            results.append(result)
        if 1 == len(results):
            return results[0]
        return results