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This is an encoder-decoder model based on mT5-base that was trained on multi-language natural language inference datasets as well as on multiple text classification datasets.

The model demonstrates a better contextual understanding of text and verbalized label because both inputs are encoded by different parts of a model - encoder and decoder respectively.

The zero-shot classifier supports nearly 100 languages and can work in both directions, meaning that labels and text can belong to different languages.

Install the neccessary libraries before using it

Because of the different model architecture, we can't use transformers' "zero-shot-classification" pipeline. For that, we developed a special library called LiqFit. If you haven't install sentencepiece library you need to install it as well to use T5 tokenizers.

pip install liqfit sentencepiece

With the LiqFit pipeline

The model can be loaded with the zero-shot-classification pipeline like so:

from liqfit.pipeline import ZeroShotClassificationPipeline
from liqfit.models import T5ForZeroShotClassification
from transformers import T5Tokenizer

model = T5ForZeroShotClassification.from_pretrained('knowledgator/comprehend_it-multilingual-t5-base')
tokenizer = T5Tokenizer.from_pretrained('knowledgator/comprehend_it-multilingual-t5-base')
classifier = ZeroShotClassificationPipeline(model=model, tokenizer=tokenizer,
                                                      hypothesis_template = '{}', encoder_decoder = True)

You can then use this pipeline to classify sequences into any of the class names you specify.

sequence_to_classify = "one day I will see the world"
candidate_labels = ['travel', 'cooking', 'dancing']
classifier(sequence_to_classify, candidate_labels, multi_label=False)
{'sequence': 'one day I will see the world',
 'labels': ['travel', 'cooking', 'dancing'],
 'scores': [0.7350383996963501, 0.1484801471233368, 0.1164814680814743]}

Amoung Enlish you can use the model for many other languages, such as Ukrainian:

sequence_to_classify = "Одного дня я побачу цей світ."
candidate_labels = ['подорож', 'кулінарія', 'танці']
classifier(sequence_to_classify, candidate_labels, multi_label=False)
{'sequence': 'Одного дня я побачу цей світ.',
 'labels': ['подорож', 'кулінарія', 'танці'],
 'scores': [0.6393420696258545, 0.2657214105129242, 0.09493650496006012]}

The model works even if labels and text are different languages:

sequence_to_classify = "Одного дня я побачу цей світ"
candidate_labels = ['travel', 'cooking', 'dancing']
classifier(sequence_to_classify, candidate_labels, multi_label=False)
{'sequence': 'Одного дня я побачу цей світ',
 'labels': ['travel', 'cooking', 'dancing'],
 'scores': [0.7676175236701965, 0.15484870970249176, 0.07753374427556992]}


Below, you can see the F1 score on several text classification datasets. All tested models were not fine-tuned on those datasets and were tested in a zero-shot setting.

Model IMDB AG_NEWS Emotions
Bart-large-mnli (407 M) 0.89 0.6887 0.3765
Deberta-base-v3 (184 M) 0.85 0.6455 0.5095
Comprehendo (184M) 0.90 0.7982 0.5660
Comprehendo-multi-lang (390M) 0.88 0.8372 -
SetFit BAAI/bge-small-en-v1.5 (33.4M) 0.86 0.5636 0.5754

Future reading

Check our blogpost - "The new milestone in zero-shot capabilities (it’s not Generative AI).", where we highlighted possible use-cases of the model and why next-token prediction is not the only way to achive amazing zero-shot capabilites. While most of the AI industry is focused on generative AI and decoder-based models, we are committed to developing encoder-based models. We aim to achieve the same level of generalization for such models as their decoder brothers. Encoders have several wonderful properties, such as bidirectional attention, and they are the best choice for many information extraction tasks in terms of efficiency and controllability.


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