Merge pull request #114 from tensorops/encoder_block_example

refactor: modify the encoder_only_classifier.py name

feat: an encoder-only classifier on IMDB dataset

feat: an encoder only example on imdb dataset

Merge pull request #111 from tensorops/atomic_masks

feat: update license to MIT

refactor: removed unnecessary sequence package under the masks and moved the padding and lookahead masks to their respective files under the main masks package.

test: comment out the dilated attention tests as they are not implemented yet.

test: the PaddingMask works and supports scores and padding_mask as intput

test: Lookahead works fine and its test case is correct

refactor: build_mask of the dilation mask generator

feat: Add DilatedAttentionMask

test: Dot product with causal masking

refactor: Uncomment the new lookahead masking

refactor: remove obsolete masking system in the dot_product_attention.py