tf.data.experimental.Optional

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Class Optional

Wraps a value that may/may not be present at runtime.

Aliases:

  • Class tf.compat.v1.data.experimental.Optional
  • Class tf.compat.v2.data.experimental.Optional

An Optional can represent the result of an operation that may fail as a value, rather than raising an exception and halting execution. For example, tf.data.experimental.get_next_as_optional returns an Optional that either contains the next value from a tf.compat.v1.data.Iterator if one exists, or a "none" value that indicates the end of the sequence has been reached.

Optional can only be used by values that are convertible to Tensor or CompositeTensor.

Properties

value_structure

The structure of the components of this optional.

Returns:

A Structure object representing the structure of the components of this optional.

Methods

from_value

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@staticmethod
from_value(value)

Returns an Optional that wraps the given value.

Args:

  • value: A value to wrap. The value must be convertible to Tensor or CompositeTensor.

Returns:

An Optional that wraps value.

get_value

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get_value(name=None)

Returns the value wrapped by this optional.

If this optional does not have a value (i.e. self.has_value() evaluates to False), this operation will raise tf.errors.InvalidArgumentError at runtime.

Args:

  • name: (Optional.) A name for the created operation.

Returns:

The wrapped value.

has_value

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has_value(name=None)

Returns a tensor that evaluates to True if this optional has a value.

Args:

  • name: (Optional.) A name for the created operation.

Returns:

A scalar tf.Tensor of type tf.bool.

none_from_structure

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@staticmethod
none_from_structure(value_structure)

Returns an Optional that has no value.

NOTE: This method takes an argument that defines the structure of the value that would be contained in the returned Optional if it had a value.

Args:

  • value_structure: A Structure object representing the structure of the components of this optional.

Returns:

An Optional that has no value.

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