Python v0.3.0a0+3dfb6ea

scatter_add

dragon.vm.torch.scatter_add(
  input,
  dim,
  index,
  src,
  out=None
)[source]

Add elements along the given dimension of index.

Number of dimensions of input, index, and src should be same. For 3-d input, output is updated as:

out[index[i, j, k], j, k] += src[i, j, k]  # ``dim`` is 0
out[i, index[i, j, k], k] += src[i, j, k]  # ``dim`` is 1
out[i, j, index[i, j, k]] += src[i, j, k]  # ``dim`` is 2

Examples:

y = torch.tensor([[1, 2], [3, 4]])
x = torch.tensor([[5, 6], [7, 8]])
index = torch.tensor([[0, 0], [0, 0]])
print(torch.scatter_add(y, 0, index, x))  # [[13, 16], [3, 4]]
print(torch.scatter_add(y, 1, index, x))  # [[12, 2], [18, 4]]
print(torch.scatter_add(y, 0, index, 8))  # [[17, 18], [3, 4]]
Parameters: