[英]What does " t[..., :1] " in below code means?
這是上下文:
def normal_scale_uncertainty(t, softplus_scale=0.05):
"""Create distribution with variable mean and variance"""
ts = t[..., :1]
return tfd.Normal(loc = ts,
scale = 1e-3 + tf.math.softplus(softplus_scale * ts))
簡短回答: ...
替換多個:
。
長答案:讓我們看一個例子。
In [20]: d = np.array([[[i + 2*j + 8*k for i in range(5)] for j in range(4)] for k in range(3)])
In [21]: d.shape
Out[21]: (3, 4, 5)
In [22]: d[:, :, 0]
Out[22]:
array([[ 0, 2, 4, 6],
[ 8, 10, 12, 14],
[16, 18, 20, 22]])
In [23]: d[..., 0]
Out[23]:
array([[ 0, 2, 4, 6],
[ 8, 10, 12, 14],
[16, 18, 20, 22]])
In [24]: d[:, :, 0] == d[..., 0]
Out[24]:
array([[ True, True, True, True],
[ True, True, True, True],
[ True, True, True, True]])
您可以使用d[0, ..., 0]
或d[0, ...]
嗎? 你可以。 d[..., 0, ...]
呢? 你會得到一個錯誤: IndexError: an index can only have a single ellipsis ('...')
。
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