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tff.framework.Call

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Class Call

A representation of a function invocation in TFF's internal language.

Inherits From: ComputationBuildingBlock

The call construct takes an argument tuple with two elements, the first being the function to invoke (represented as a computation with a functional result type), and the second being the argument to feed to that function. Typically, the function is either a TFF instrinsic, or a lambda expression.

The concise notation for calls is foo(bar), where foo is the function, and bar is the argument.

__init__

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__init__(
    fn,
    arg=None
)

Creates a call to 'fn' with argument 'arg'.

Args:

  • fn: A value of a functional type that represents the function to invoke.
  • arg: The optional argument, present iff 'fn' expects one, of a type that matches the type of 'fn'.

Raises:

  • TypeError: if the arguments are of the wrong types.

Properties

argument

function

proto

Returns a serialized form of this object as a pb.Computation instance.

type_signature

Returns the TFF type of this object (an instance of tff.Type).

Methods

compact_representation

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compact_representation()

Returns the compact string representation of this building block.

formatted_representation

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formatted_representation()

Returns the formatted string representation of this building block.

from_proto

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@classmethod
from_proto(
    cls,
    computation_proto
)

Returns an instance of a derived class based on 'computation_proto'.

Args:

  • computation_proto: An instance of pb.Computation.

Returns:

An instance of a class that implements 'ComputationBuildingBlock' and that contains the deserialized logic from in 'computation_proto'.

Raises:

  • NotImplementedError: if computation_proto contains a kind of computation for which deserialization has not been implemented yet.
  • ValueError: if deserialization failed due to the argument being invalid.

structural_representation

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structural_representation()

Returns the structural string representation of this building block.