回答編集履歴
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追記
answer
CHANGED
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@@ -91,6 +91,15 @@
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91
91
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x = np.array([x[...]])
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92
92
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```
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93
93
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94
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**追記：** 単にこう書いてもいいみたい。
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95
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```Python
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96
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>>> arr = np.array([[1, 2, 3], [4, 5, 6]])
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97
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>>> arr = arr[np.newaxis]
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98
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>>> print(arr)
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99
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[[[1 2 3]
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100
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[4 5 6]]]
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101
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```
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102
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94
103
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参考
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---
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- [NumPy reference - Array objects - indexing](https://docs.scipy.org/doc/numpy-1.14.0/reference/arrays.indexing.html#arrays-indexing)
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