Source code for xorbits._mars.tensor.random.standard_exponential
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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import numpy as np
from ... import opcodes as OperandDef
from ..utils import gen_random_seeds
from .core import TensorDistribution, TensorRandomOperandMixin
class TensorStandardExponential(TensorDistribution, TensorRandomOperandMixin):
_op_type_ = OperandDef.RAND_STANDARD_EXPONENTIAL
_func_name = "standard_exponential"
_fields_ = ("size",)
def __call__(self, chunk_size=None):
return self.new_tensor(None, None, raw_chunk_size=chunk_size)
[docs]def standard_exponential(
random_state, size=None, chunk_size=None, gpu=None, dtype=None
):
"""
Draw samples from the standard exponential distribution.
`standard_exponential` is identical to the exponential distribution
with a scale parameter of 1.
Parameters
----------
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.
Returns
-------
out : float or Tensor
Drawn samples.
Examples
--------
Output a 3x8000 tensor:
>>> import mars.tensor as mt
>>> n = mt.random.standard_exponential((3, 8000))
"""
if dtype is None:
dtype = np.random.RandomState().standard_exponential(size=(0,)).dtype
size = random_state._handle_size(size)
seed = gen_random_seeds(1, random_state.to_numpy())[0]
op = TensorStandardExponential(size=size, seed=seed, gpu=gpu, dtype=dtype)
return op(chunk_size=chunk_size)