tf.keras.initializers.Orthogonal

Initializer that generates an orthogonal matrix.

Inherits From: Initializer

tf.keras.initializers.Orthogonal(
    gain=1.0, seed=None
)

If the shape of the tensor to initialize is two-dimensional, it is initialized with an orthogonal matrix obtained from the QR decomposition of a matrix of random numbers drawn from a normal distribution. If the matrix has fewer rows than columns then the output will have orthogonal rows. Otherwise, the output will have orthogonal columns.

If the shape of the tensor to initialize is more than two-dimensional, a matrix of shape (shape[0] * ... * shape[n - 2], shape[n - 1]) is initialized, where n is the length of the shape vector. The matrix is subsequently reshaped to give a tensor of the desired shape.

Examples:

# Standalone usage:
initializer = keras.initializers.Orthogonal()
values = initializer(shape=(2, 2))
 
# Usage in a Keras layer:
initializer = keras.initializers.Orthogonal()
layer = keras.layers.Dense(3, kernel_initializer=initializer)

gain Multiplicative factor to apply to the orthogonal matrix.
seed A Python integer. Used to make the behavior of the initializer deterministic.

Reference:

Methods

clone

View source

clone()

from_config

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@classmethod
from_config(
    config
)

Instantiates an initializer from a configuration dictionary.

Example:

initializer = RandomUniform(-1, 1)
config = initializer.get_config()
initializer = RandomUniform.from_config(config)

Args
config A Python dictionary, the output of get_config().

Returns
An Initializer instance.

get_config

View source

get_config()

Returns the initializer's configuration as a JSON-serializable dict.

Returns
A JSON-serializable Python dict.

__call__

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__call__(
    shape, dtype=None
)

Returns a tensor object initialized as specified by the initializer.

Args
shape Shape of the tensor.
dtype Optional dtype of the tensor.