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tfnlp.models.BertClassifier

Classifier model based on a BERT-style transformer-based encoder.

This is an implementation of the network structure surrounding a transformer encoder as described in "BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding" (https://arxiv.org/abs/1810.04805).

The BertClassifier allows a user to pass in a transformer stack, and instantiates a classification network based on the passed num_classes argument. If num_classes is set to 1, a regression network is instantiated.

network A transformer network. This network should output a sequence output and a classification output. Furthermore, it should expose its embedding table via a "get_embedding_table" method.
num_classes Number of classes to predict from the classification network.
initializer The initializer (if any) to use in the classification networks. Defaults to a Glorot uniform initializer.
dropout_rate The dropout probability of the cls head.
use_encoder_pooler Whether to use the pooler layer pre-defined inside the encoder.

checkpoint_items

Methods

call

Calls the model on new inputs.

In this case call just reapplies all ops in the graph to the new inputs (e.g. build a new computational graph from the provided inputs).

Args
inputs A tensor or list of tensors.
training Boolean or boolean scalar tensor, indicating whether to run the Network in training mode or inference mode.
mask A mask or list of masks. A mask can be either a tensor or None (no mask).

Returns
A tensor if there is a single output, or a list of tensors if there are more than one outputs.