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tf.nn.embedding_lookup

Looks up embeddings for the given ids from a list of tensors.

tf.nn.embedding_lookup(
    params, ids, max_norm=None, name=None
)

This function is used to perform parallel lookups on the list of tensors in params. It is a generalization of tf.gather, where params is interpreted as a partitioning of a large embedding tensor.

If len(params) > 1, each element id of ids is partitioned between the elements of params according to the "div" partition strategy, which means we assign ids to partitions in a contiguous manner. For instance, 13 ids are split across 5 partitions as: [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10], [11, 12]].

If the id space does not evenly divide the number of partitions, each of the first (max_id + 1) % len(params) partitions will be assigned one more id.

The results of the lookup are concatenated into a dense tensor. The returned tensor has shape shape(ids) + shape(params)[1:].

Args
`params`	A single tensor representing the complete embedding tensor, or a list of tensors all of same shape except for the first dimension, representing sharded embedding tensors following "div" partition strategy.
`ids`	A `Tensor` with type `int32` or `int64` containing the ids to be looked up in `params`.
`max_norm`	If not `None`, each embedding is clipped if its l2-norm is larger than this value.
`name`	A name for the operation (optional).

Returns

Returns
A `Tensor` with the same type as the tensors in `params`. For instance, if `params` is a 5x2 matrix: [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]] or a list of matrices: params[0]: [[1, 2], [3, 4]] params[1]: [[5, 6], [7, 8]] params[2]: [[9, 10]] and `ids` is: [0, 3, 4] The output will be a 3x2 matrix: [[1, 2], [7, 8], [9, 10]]

A Tensor with the same type as the tensors in params.

For instance, if params is a 5x2 matrix:

[[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]

or a list of matrices:

params[0]: [[1, 2], [3, 4]]
params[1]: [[5, 6], [7, 8]]
params[2]: [[9, 10]]

and ids is:

[0, 3, 4]

The output will be a 3x2 matrix:

[[1, 2], [7, 8], [9, 10]]

Raises
`ValueError`	If `params` is empty.

© 2020 The TensorFlow Authors. All rights reserved.
Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r2.3/api_docs/python/tf/nn/embedding_lookup