了解scatter操作:
tensor_A.scatter_(dim, index, tensor_B)
: tensor_B的每個元素,都按照 index 被scatter(可以了解為填充)到目标tensor_A中。
(1) index和源tensor_B次元一緻;
(2) tensor_A一般是全零的張量,其某些特定位置的值由 tensor_B 中的值填充。
(3) 注意如何根據index選取tensor_B中的值:
對于2-D tensor:
if dim=0, tensor_A[index[i][j]][j] = tensor_B[i][j];
if dim=1, tensor_A[i][index[i][j]] = tensor_B[i][j];
對于3-D tensor:
if dim = 0,tensor_A[index[i][j][k]][j][k] = tensor_B[i][j][k]
if dim = 1,tensor_A[i][index[i][j][k]][k] = tensor_B[i][j][k]
if dim = 2,tensor_A[i][j][index[i][j][k]] = tensor_B[i][j][k]
舉例:
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsICM38FdsYkRGZkRG9lcvx2bjxiNx8VZ6l2cs0TPn1UMBR1TwklaOBDOsJGcohVYsR2MMBjVtJWd0ckW65UbM5WOHJWa5kHT20ESjBjUIF2X0hXZ0xCMx81dvRWYoNHLrdEZwZ1Rh5WNXp1bwNjW1ZUba9VZwlHdssmch1mclRXY39CXldWYtlWPzNXZj9mcw1ycz9WL49zZuBnLkZmNzkDZmZWOwEGM4UDMilDZ4QTYhRjZ1ETMjZGMyAzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
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