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The original BERT uses a subword-level tokenization with the vocabulary size of 30K which is learned after input preprocessing and using several heuristics. RoBERTa uses bytes instead of unicode characters as the base for subwords and expands the vocabulary size up to 50K without any preprocessing or input tokenization.
It happens due to the fact that reaching the document boundary and stopping there means that an input sequence will contain less than 512 tokens. For having a similar number of tokens across all batches, the batch size in such cases needs to be augmented. This leads to variable batch size and more complex comparisons which researchers wanted to avoid.
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This is useful if you want more control over how to convert input_ids indices into associated vectors
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Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general
Use it as a regular PyTorch Module and refer to the PyTorch documentation for all matter related to general
Apart from it, RoBERTa applies all four described aspects above with Descubra the same architecture parameters as BERT large. The Perfeito number of parameters of RoBERTa is 355M.
Attentions weights after the attention softmax, used to compute the weighted average in the self-attention
The problem arises when we reach the end of a document. In this aspect, researchers compared whether it was worth stopping sampling sentences for such sequences or additionally sampling the first several sentences of the next document (and adding a corresponding separator token between documents). The results showed that the first option is better.
model. Initializing with a config file does not load the weights associated with the model, only the configuration.
dynamically changing the masking pattern applied to the training data. The authors also collect a large new dataset ($text CC-News $) of comparable size to other privately used datasets, to better control for training set size effects
This is useful if you want more control over how to convert input_ids indices into associated vectors