mxfusion.components.distributions.categorical

Members

class mxfusion.components.distributions.categorical.CategoricalLogPDFDecorator

Bases: mxfusion.components.distributions.distribution.LogPDFDecorator

class mxfusion.components.distributions.categorical.CategoricalDrawSamplesDecorator

Bases: mxfusion.components.distributions.distribution.DrawSamplesDecorator

class mxfusion.components.distributions.categorical.Categorical(log_prob, num_classes, one_hot_encoding=False, normalization=True, axis=-1, rand_gen=None, dtype=None, ctx=None)

Bases: mxfusion.components.distributions.univariate.UnivariateDistribution

The Categorical distribution.

Parameters:
  • log_prob (Variable) – the logarithm of the probability being in each of the classes.
  • num_classes (int) – the number of classes.
  • one_hot_encoding (boolean) – If true, the random variable is one-hot encoded.
  • normalization (boolean) – If true, a softmax normalization is applied.
  • axis (int) – the axis in which the categorical distribution is assumed (default: -1).
  • rand_gen (RandomGenerator) – the random generator (default: MXNetRandomGenerator).
  • dtype (numpy.float32 or numpy.float64) – the data type for float point numbers.
  • ctx (None or mxnet.cpu or mxnet.gpu) – the mxnet context (default: None/current context).
replicate_self(attribute_map=None)

This functions as a copy constructor for the object. In order to do a copy constructor we first call __new__ on the class which creates a blank object. We then initialize that object using the methods standard init procedures, and do any extra copying of attributes.

Replicates this Factor, using new inputs, outputs, and a new uuid. Used during model replication to functionally replicate a factor into a new graph.

Parameters:
  • inputs (List of tuples of name to node e.g. [('random_variable': Variable y)] or None) – new input variables of the factor.
  • outputs (List of tuples of name to node e.g. [('random_variable': Variable y)] or None) – new output variables of the factor.
log_pdf(F, variables)

Computes the logrithm of the probability density/mass function (PDF/PMF) of the distribution. The inputs and outputs variables are fetched from the variables argument according to their UUIDs.

Parameters:
  • F (mxnet.symbol or mxnet.ndarray) – the MXNet computation mode
  • variables – the set of MXNet arrays that holds the values of

variables at runtime. :type variables: {str(UUID): MXNet NDArray or MXNet Symbol} :returns: log pdf of the distribution :rtypes: MXNet NDArray or MXNet Symbol

draw_samples(F, variables, num_samples=1, always_return_tuple=False)

Draw a set of samples from the distribution. The inputs variables are fetched from the variables argument according to their UUIDs.

Parameters:
  • F (mxnet.symbol or mxnet.ndarray) – the MXNet computation mode
  • variables – the set of MXNet arrays that holds the values of

variables at runtime. :type variables: {str(UUID): MXNet NDArray or MXNet Symbol} :param num_samples: the number of drawn samples (default: one) :int num_samples: int :param always_return_tuple: Whether return a tuple even if there is only one variables in outputs. :type always_return_tuple: boolean :returns: a set samples of the distribution :rtypes: MXNet NDArray or MXNet Symbol or [MXNet NDArray or MXNet Symbol]

static define_variable(log_prob, num_classes, shape=None, one_hot_encoding=False, normalization=True, axis=-1, rand_gen=None, dtype=None, ctx=None)

Creates and returns a random variable drawn from a Categorical distribution.

Parameters:
  • log_prob (Variable) – the logarithm of the probability being in each of the classes.
  • num_classes (int) – the number of classes.
  • shape (tuple of int) – the shape of the Categorical variable.
  • one_hot_encoding (boolean) – If true, the random variable is one-hot encoded.
  • normalization (boolean) – If true, a softmax normalization is applied.
  • axis (int) – the axis in which the categorical distribution is assumed (default: -1).
  • rand_gen (RandomGenerator) – the random generator (default: MXNetRandomGenerator).
  • dtype (numpy.float32 or numpy.float64) – the data type for float point numbers.
  • ctx (None or mxnet.cpu or mxnet.gpu) – the mxnet context (default: None/current context).
Returns:

RandomVariable drawn from the Categorical distribution.
Rtypes:

Variable