* Initial draft of TransformersClassifier
* Add transformers classifier implementation
* Add test for SentenceTransformersClassifier
* Add truncation and corresponding test case to Classifier
* Add zero-shot classification and test
* Add document classifier documentation
* Add latest docstring and tutorial changes
* print meta data with print_documents()
* Add latest docstring and tutorial changes
* Remove top_k param from Classifier usage example
* Add latest docstring and tutorial changes
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