回答編集履歴
2
追記
test
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@@ -49,3 +49,101 @@
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英語ですが、以下のサイトが参考になります。
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[A basic introduction to NumPy's einsum – ajcr – Haphazard investigations](http://ajcr.net/Basic-guide-to-einsum/)
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---
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```python
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"""
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i = 第0軸
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j = 第1軸
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k = 第2軸
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"""
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----- a -----
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j 0 1 2
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i k 0 1 2
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0 #[[[1 2 3] [4 5 6] [7 8 9]]
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1 # [[1 2 3] [4 5 6] [7 8 9]]
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2 # [[1 2 3] [4 5 6] [7 8 9]]
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3 # [[1 2 3] [4 5 6] [7 8 9]]]
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----- b -----
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j 0 1 2
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i k 0 1 2
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0 #[ [1 0 0]
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1 # [2 0 0]
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2 # [3 0 0]
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3 # [4 0 0] ]
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"""
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A{i, j, k} と B{i, j, k} を要素ごとに掛け算したい。
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Bには [i,j,k] の3軸のうち、真ん中の軸が欠けている。
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→→Bの2軸の間にj軸を追加すると以下のようになる
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"""
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----- b[:,None,:] -----
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j 0 1 2
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i k 0 1 2
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0 #[[[1 0 0] [ > ] [ > ]]
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1 # [[2 0 0] [ > ] [ > ]]
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2 # [[3 0 0] [ > ] [ > ]]
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3 # [[4 0 0] [ > ] [ > ]]]
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"""
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k（第2軸）を総計して潰すので、sum(axis=2)
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"""
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----- (a*b[:, None, :]).sum(2) -----
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j 0 1 2
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i k -
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0 # [[ 1 4 7]
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1 # [ 2 8 14]
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2 # [ 3 12 21]
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3 # [ 4 16 28]]
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```
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1
追記
test
CHANGED
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@@ -43,3 +43,9 @@
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ということですか？
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49
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英語ですが、以下のサイトが参考になります。
|
|
50
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+
|
|
51
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+
[A basic introduction to NumPy's einsum – ajcr – Haphazard investigations](http://ajcr.net/Basic-guide-to-einsum/)
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