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Specifications and Common Mistakes

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mindspore.Symbol

class mindspore.Symbol(max=0, min=1, divisor=1, remainder=0, unique=False, **kawgs)

Symbol is a data structure to indicate the symbolic info of shape.

For dynamic shape networks, compared with only setting the unknown dimensions ( None ) in Tensor , providing more symbolic shape info can help the framework better optimize the computation graph, to improve the performance of network execution.

Parameters

• max (int) – The maximum length of this dimension, which is valid when it's greater than min. Default: 0 .

• min (int) – The minimum length of this dimension. Default: 1 .

• divisor (int) – The divisor( $d$ ). When remainder is 0, it means this dimension can be divided by $d$ . Default: 1 .

• remainder (int) – The remainder( $r$ ) when symbol is represented by $d\ast N+r,N\ge 1$ . Default: 0 .

• unique (bool) – When the symbol object is used multiple times, if unique is True , the shape items of this symbol are considered to be same length, otherwise only symbol info is shared by multiple dimensions. Default: False .

Outputs:

Symbol.

Raises

• TypeError – If max, min, divisor, remainder is not an int.

• TypeError – If unique is not a bool.

• ValueError – If min is not positive value.

• ValueError – If divisor is not positive value.

• ValueError – If remainder is not in the range $[0,d)$ .

Examples

>>> import numpy as np
>>> import mindspore as ms
>>> from mindspore import nn, Tensor, Symbol
>>>
>>> class Net(nn.Cell):
...     def __init__(self):
...         super(Net, self).__init__()
...         self.abs = ms.ops.Abs()
...     def construct(self, x):
...         return self.abs(x)
...
>>> net = Net()
>>> s1 = Symbol(divisor=8, remainder=1)
>>> s2 = Symbol(max=32, unique=True)
>>> dyn_t = Tensor(shape=(None, s1, s1, s2, s2), dtype=ms.float32)
>>> net.set_inputs(dyn_t)
>>> # the shape values of last two dimensions must be equal, because "s2" is set to "unique"
>>> net(Tensor(np.random.randn(1, 9, 17, 32, 32), dtype=ms.float32)).shape
(1, 9, 17, 32, 32)
>>> net(Tensor(np.random.randn(8, 25, 9, 30, 30), dtype=ms.float32)).shape
(8, 25, 9, 30, 30)