TokenAndPositionEmbedding 层
TokenAndPositionEmbedding class
keras_nlp.layers.TokenAndPositionEmbedding(
vocabulary_size,
sequence_length,
embedding_dim,
tie_weights=True,
embeddings_initializer="uniform",
mask_zero=False,
**kwargs
)
A layer which sums a token and position embedding.
Token and position embeddings are ways of representing words and their order
in a sentence. This layer creates a keras.layers.Embedding token embedding
and a keras_nlp.layers.PositionEmbedding position embedding and sums their
output when called. This layer assumes that the last dimension in the input
corresponds to the sequence dimension.
Arguments
- vocabulary_size: The size of the vocabulary.
- sequence_length: The maximum length of input sequence
- embedding_dim: The output dimension of the embedding layer
- tie_weights: Boolean, whether or not the matrix for embedding and
the matrix for the
reverseprojection should share the same weights. - embeddings_initializer: The initializer to use for the Embedding Layers
- mask_zero: Boolean, whether or not the input value 0 is a special "padding" value that should be masked out. This is useful when using recurrent layers which may take variable length input. If this is True, then all subsequent layers in the model need to support masking or an exception will be raised. If mask_zero` is set to True, as a consequence, index 0 cannot be used in the vocabulary (input_dim should equal size of vocabulary + 1).
- **kwargs: other keyword arguments passed to
keras.layers.Layer, includingname,trainable,dtypeetc.
Example
inputs = np.ones(shape=(1, 50), dtype="int32")
embedding_layer = keras_nlp.layers.TokenAndPositionEmbedding(
vocabulary_size=10_000,
sequence_length=50,
embedding_dim=128,
)
outputs = embedding_layer(inputs)