tf.lookup.StaticHashTable

TensorFlow 1 version View source on GitHub

A generic hash table that is immutable once initialized.

Used in the notebooks

Used in the tutorials

Example usage:

keys_tensor = tf.constant([1, 2])
vals_tensor = tf.constant([3, 4])
input_tensor = tf.constant([1, 5])
table = tf.lookup.StaticHashTable(
    tf.lookup.KeyValueTensorInitializer(keys_tensor, vals_tensor), -1)
print(table.lookup(input_tensor))

initializer The table initializer to use. See HashTable kernel for supported key and value types.
default_value The value to use if a key is missing in the table.
name A name for the operation (optional).

default_value The default value of the table.
key_dtype The table key dtype.
name The name of the table.
resource_handle Returns the resource handle associated with this Resource.
value_dtype The table value dtype.

Methods

export

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Returns tensors of all keys and values in the table.

Args
name A name for the operation (optional).

Returns
A pair of tensors with the first tensor containing all keys and the second tensors containing all values in the table.

lookup

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Looks up keys in a table, outputs the corresponding values.

The default_value is used for keys not present in the table.

Args
keys Keys to look up. May be either a SparseTensor or dense Tensor.
name A name for the operation (optional).

Returns
A SparseTensor if keys are sparse, otherwise a dense Tensor.

Raises
TypeError when keys or default_value doesn't match the table data types.

size

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Compute the number of elements in this table.

Args
name A name for the operation (optional).

Returns
A scalar tensor containing the number of elements in this table.