Table Of Contents
Table Of Contents


mxnet.ndarray.random.gamma(alpha=1, beta=1, shape=_Null, dtype=_Null, ctx=None, out=None, **kwargs)[source]

Draw random samples from a gamma distribution.

Samples are distributed according to a gamma distribution parametrized by alpha (shape) and beta (scale).

  • alpha (float or NDArray, optional) – The shape of the gamma distribution. Should be greater than zero.

  • beta (float or NDArray, optional) – The scale of the gamma distribution. Should be greater than zero. Default is equal to 1.

  • shape (int or tuple of ints, optional) – The number of samples to draw. If shape is, e.g., (m, n) and alpha and beta are scalars, output shape will be (m, n). If alpha and beta are NDArrays with shape, e.g., (x, y), then output will have shape (x, y, m, n), where m*n samples are drawn for each [alpha, beta) pair.

  • dtype ({'float16', 'float32', 'float64'}, optional) – Data type of output samples. Default is ‘float32’

  • ctx (Context, optional) – Device context of output. Default is current context. Overridden by alpha.context when alpha is an NDArray.

  • out (NDArray, optional) – Store output to an existing NDArray.


>>> mx.nd.random.gamma(1, 1)
[ 1.93308783]
<NDArray 1 @cpu(0)>
>>> mx.nd.random.gamma(1, 1, shape=(2,))
[ 0.48216391  2.09890771]
<NDArray 2 @cpu(0)>
>>> alpha = mx.nd.array([1,2,3])
>>> beta = mx.nd.array([2,3,4])
>>> mx.nd.random.gamma(alpha, beta, shape=2)
[[  3.24343276   0.94137681]
 [  3.52734375   0.45568955]
 [ 14.26264095  14.0170126 ]]
<NDArray 3x2 @cpu(0)>