mindspore.set_seed

class mindspore.set_seed(seed)

设置全局种子。

Note

• 全局种子可用于numpy.random, mindspore.common.Initializer, mindspore.ops.composite.random_ops以及mindspore.nn.probability.distribution。

• 如果没有设置全局种子，这些包将会各自使用自己的种子，numpy.random和mindspore.common.Initializer将会随机选择种子值，mindspore.ops.composite.random_ops和mindspore.nn.probability.distribution将会使用零作为种子值。

• numpy.random.seed()设置的种子仅能被numpy.random使用，而这个API设置的种子也可被numpy.random使用，因此推荐使用这个API设置所有的种子。

参数：

• seed (int) – 设置的全局种子。

异常:

• ValueError – 种子值非法 (小于0)。

• TypeError – 种子值非整型数。

样例：

>>> import numpy as np
>>> import mindspore.ops as ops
>>> from mindspore import Tensor, set_seed, Parameter
>>> from mindspore.common.initializer import initializer
>>> import mindspore as ms
>>> # Note: (1) Please make sure the code is running in PYNATIVE MODE;
>>> # (2) Because Composite-level ops need parameters to be Tensors, for below examples,
>>> # when using ops.uniform operator, minval and maxval are initialised as:
>>> minval = Tensor(1.0, ms.float32)
>>> maxval = Tensor(2.0, ms.float32)
>>>
>>> # 1. If global seed is not set, numpy.random and initializer will choose a random seed:
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A1
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A2
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W1
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W2
>>> # Rerun the program will get different results:
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A3
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A4
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W3
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W4
>>>
>>> # 2. If global seed is set, numpy.random and initializer will use it:
>>> set_seed(1234)
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A1
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A2
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W1
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W2
>>> # Rerun the program will get the same results:
>>> set_seed(1234)
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A1
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A2
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W1
>>> w1 = Parameter(initializer("uniform", [2, 2], ms.float32), name="w1") # W2
>>>
>>> # 3. If neither global seed nor op seed is set, mindspore.ops.composite.random_ops and
>>> # mindspore.nn.probability.distribution will choose a random seed:
>>> c1 = ops.uniform((1, 4), minval, maxval) # C1
>>> c2 = ops.uniform((1, 4), minval, maxval) # C2
>>> # Rerun the program will get different results:
>>> c1 = ops.uniform((1, 4), minval, maxval) # C3
>>> c2 = ops.uniform((1, 4), minval, maxval) # C4
>>>
>>> # 4. If global seed is set, but op seed is not set, mindspore.ops.composite.random_ops and
>>> # mindspore.nn.probability.distribution will calculate a seed according to global seed and
>>> # default op seed. Each call will change the default op seed, thus each call get different
>>> # results.
>>> set_seed(1234)
>>> c1 = ops.uniform((1, 4), minval, maxval) # C1
>>> c2 = ops.uniform((1, 4), minval, maxval) # C2
>>> # Rerun the program will get the same results:
>>> set_seed(1234)
>>> c1 = ops.uniform((1, 4), minval, maxval) # C1
>>> c2 = ops.uniform((1, 4), minval, maxval) # C2
>>>
>>> # 5. If both global seed and op seed are set, mindspore.ops.composite.random_ops and
>>> # mindspore.nn.probability.distribution will calculate a seed according to global seed and
>>> # op seed counter. Each call will change the op seed counter, thus each call get different
>>> # results.
>>> set_seed(1234)
>>> c1 = ops.uniform((1, 4), minval, maxval, seed=2) # C1
>>> c2 = ops.uniform((1, 4), minval, maxval, seed=2) # C2
>>> # Rerun the program will get the same results:
>>> set_seed(1234)
>>> c1 = ops.uniform((1, 4), minval, maxval, seed=2) # C1
>>> c2 = ops.uniform((1, 4), minval, maxval, seed=2) # C2
>>>
>>> # 6. If op seed is set but global seed is not set, 0 will be used as global seed. Then
>>> # mindspore.ops.composite.random_ops and mindspore.nn.probability.distribution act as in
>>> # condition 5.
>>> c1 = ops.uniform((1, 4), minval, maxval, seed=2) # C1
>>> c2 = ops.uniform((1, 4), minval, maxval, seed=2) # C2
>>> # Rerun the program will get the different results:
>>> c1 = ops.uniform((1, 4), minval, maxval, seed=2) # C1
>>> c2 = ops.uniform((1, 4), minval, maxval, seed=2) # C2
>>>
>>> # 7. Recall set_seed() in the program will reset numpy seed and op seed counter of
>>> # mindspore.ops.composite.random_ops and mindspore.nn.probability.distribution.
>>> set_seed(1234)
>>> np_1 = np.random.normal(0, 1, [1]).astype(np.float32) # A1
>>> c1 = ops.uniform((1, 4), minval, maxval, seed=2) # C1
>>> set_seed(1234)
>>> np_2 = np.random.normal(0, 1, [1]).astype(np.float32) # still get A1
>>> c2 = ops.uniform((1, 4), minval, maxval, seed=2) # still get C1