捷徑

torch.frexp

torch.frexp(input, *, out=None) -> (Tensor mantissa, Tensor exponent)

input 分解為尾數 (mantissa) 和指數 (exponent) 張量,使得 input=mantissa×2exponent\text{input} = \text{mantissa} \times 2^{\text{exponent}}

尾數 (mantissa) 的範圍是開區間 (-1, 1)。

支援浮點數輸入。

參數

input (Tensor) – 輸入張量

關鍵字參數

out (tuple, optional) – 輸出張量

範例

>>> x = torch.arange(9.)
>>> mantissa, exponent = torch.frexp(x)
>>> mantissa
tensor([0.0000, 0.5000, 0.5000, 0.7500, 0.5000, 0.6250, 0.7500, 0.8750, 0.5000])
>>> exponent
tensor([0, 1, 2, 2, 3, 3, 3, 3, 4], dtype=torch.int32)
>>> torch.ldexp(mantissa, exponent)
tensor([0., 1., 2., 3., 4., 5., 6., 7., 8.])

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