mars.tensor.random.ranf(size=None, chunk_size=None, gpu=None, dtype=None)

Return random floats in the half-open interval [0.0, 1.0).

Results are from the “continuous uniform” distribution over the stated interval. To sample \(Unif[a, b), b > a\) multiply the output of random_sample by (b-a) and add a:

(b - a) * random_sample() + a
  • size (int or tuple of ints, optional) – Output shape. If the given shape is, e.g., (m, n, k), then m * n * k samples are drawn. Default is None, in which case a single value is returned.

  • 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.


out – Array of random floats of shape size (unless size=None, in which case a single float is returned).

Return type

float or Tensor of floats


>>> import mars.tensor as mt
>>> mt.random.random_sample().execute()
>>> type(mt.random.random_sample().execute())
<type 'float'>
>>> mt.random.random_sample((5,)).execute()
array([ 0.30220482,  0.86820401,  0.1654503 ,  0.11659149,  0.54323428])

Three-by-two array of random numbers from [-5, 0):

>>> (5 * mt.random.random_sample((3, 2)) - 5).execute()
array([[-3.99149989, -0.52338984],
       [-2.99091858, -0.79479508],
       [-1.23204345, -1.75224494]])