mars.tensor.random.geometric¶
- mars.tensor.random.geometric(p, size=None, chunk_size=None, gpu=None, dtype=None)[源代码]¶
Draw samples from the geometric distribution.
Bernoulli trials are experiments with one of two outcomes: success or failure (an example of such an experiment is flipping a coin). The geometric distribution models the number of trials that must be run in order to achieve success. It is therefore supported on the positive integers,
k = 1, 2, ...
.The probability mass function of the geometric distribution is
\[f(k) = (1 - p)^{k - 1} p\]where p is the probability of success of an individual trial.
- 参数
p (float or array_like of floats) – The probability of success of an individual trial.
size (int or tuple of ints, optional) – Output shape. If the given shape is, e.g.,
(m, n, k)
, thenm * n * k
samples are drawn. If size isNone
(default), a single value is returned ifp
is a scalar. Otherwise,mt.array(p).size
samples are drawn.chunk_size (int or tuple of int or tuple of ints, optional) – Desired chunk size on each dimension
gpu (bool, optional) – Allocate the tensor on GPU if True, False as default
dtype (data-type, optional) – Data-type of the returned tensor.
- 返回
out – Drawn samples from the parameterized geometric distribution.
- 返回类型
Tensor or scalar
实际案例
Draw ten thousand values from the geometric distribution, with the probability of an individual success equal to 0.35:
>>> import mars.tensor as mt
>>> z = mt.random.geometric(p=0.35, size=10000)
How many trials succeeded after a single run?
>>> ((z == 1).sum() / 10000.).execute() 0.34889999999999999 #random