Weight Initializers

Weight initializers are used to initialize arrays. They destructively modify the content of numpy.ndarray or cupy.ndarray. Typically, weight initializers are passed to Links to initialize their weights and biases.

A weight initializer can be any of the following objects.

• chainer.Initializer class instance.

• Python or NumPy scalar or numpy.ndarray.

• A callable that takes an array (numpy.ndarray or cupy.ndarray) and feeds the initial data into it.

• None, in which case the default initializer is used. Unless explicitly specified, it is LeCunNormal with scale value 1.

If an initializer object has the dtype attribute, the initializer can assume that the array to feed the data into has that dtype. If the required dtype, depending on the context where the initializer is used, does not match the dtype attribute, Chainer will report an error.

Base class

chainer.Initializer

Initializes array.

Concrete initializers

chainer.initializers.Identity	Initializes array with the identity matrix.
chainer.initializers.Constant	Initializes array with constant value.
chainer.initializers.Zero	Initializes array to all-zero.
chainer.initializers.One	Initializes array to all-one.
chainer.initializers.NaN	Initializes array to all-NaN.
chainer.initializers.Normal	Initializes array with a normal distribution.
chainer.initializers.LeCunNormal	Initializes array with scaled Gaussian distribution.
chainer.initializers.GlorotNormal	Initializes array with scaled Gaussian distribution.
chainer.initializers.HeNormal	Initializes array with scaled Gaussian distribution.
chainer.initializers.Orthogonal	Initializes array with an orthogonal system.
chainer.initializers.Uniform	Initializes array with a scaled uniform distribution.
chainer.initializers.LeCunUniform	Initializes array with a scaled uniform distribution.
chainer.initializers.GlorotUniform	Initializes array with a scaled uniform distribution.
chainer.initializers.HeUniform	Initializes array with scaled uniform distribution.

Helper function

chainer.initializers.generate_array

Return initialized array.