LostTech.TensorFlow : API Documentation

Type MixtureSameFamily

Namespace tensorflow.contrib.distributions

Parent Distribution

Interfaces IMixtureSameFamily

Mixture (same-family) distribution.

The `MixtureSameFamily` distribution implements a (batch of) mixture distribution where all components are from different parameterizations of the same distribution type. It is parameterized by a `Categorical` "selecting distribution" (over `k` components) and a components distribution, i.e., a `Distribution` with a rightmost batch shape (equal to `[k]`) which indexes each (batch of) component.

#### Examples
Show Example 
import tensorflow_probability as tfp
            tfd = tfp.distributions 
 ### Create a mixture of two scalar Gaussians: 
 gm = tfd.MixtureSameFamily(
    mixture_distribution=tfd.Categorical(
        probs=[0.3, 0.7]),
    components_distribution=tfd.Normal(
      loc=[-1., 1],       # One for each component.
      scale=[0.1, 0.5]))  # And same here. 
 gm.mean()
# ==> 0.4 
 gm.variance()
# ==> 1.018 
 # Plot PDF.
x = np.linspace(-2., 3., int(1e4), dtype=np.float32)
import matplotlib.pyplot as plt
plt.plot(x, gm.prob(x).eval()); 
 ### Create a mixture of two Bivariate Gaussians: 
 gm = tfd.MixtureSameFamily(
    mixture_distribution=tfd.Categorical(
        probs=[0.3, 0.7]),
    components_distribution=tfd.MultivariateNormalDiag(
        loc=[[-1., 1],  # component 1
             [1, -1]],  # component 2
        scale_identity_multiplier=[.3,.6])) 
 gm.mean()
# ==> array([ 0.4, -0.4], dtype=float32) 
 gm.covariance()
# ==> array([[ 1.119, -0.84],
#            [-0.84,  1.119]], dtype=float32) 
 # Plot PDF contours.
def meshgrid(x, y=x):
  [gx, gy] = np.meshgrid(x, y, indexing='ij')
  gx, gy = np.float32(gx), np.float32(gy)
  grid = np.concatenate([gx.ravel()[None, :], gy.ravel()[None, :]], axis=0)
  return grid.T.reshape(x.size, y.size, 2)
grid = meshgrid(np.linspace(-2, 2, 100, dtype=np.float32))
plt.contour(grid[..., 0], grid[..., 1], gm.prob(grid).eval());

Properties

Public properties

object allow_nan_stats get;

object allow_nan_stats_dyn get;

TensorShape batch_shape get;

object batch_shape_dyn get;

object components_distribution get;

object components_distribution_dyn get;

object dtype get;

object dtype_dyn get;

TensorShape event_shape get;

object event_shape_dyn get;

Categorical mixture_distribution get;

object mixture_distribution_dyn get;

string name get;

object name_dyn get;

IDictionary<object, object> parameters get;

object parameters_dyn get;

object PythonObject get;

object reparameterization_type get;

object reparameterization_type_dyn get;

object validate_args get;

object validate_args_dyn get;