Problem with gather function

1

hy,
i have tow tensors
ind with size = (2, 261234, 1)
g = with size = (2, 783456, 1)
i wante to gather tem with the gather function, and put the result in g
whene i write g = g.gather(1, ind) the folowing error apeer:
RuntimeError: Expected object of type torch.LongTensor but found type torch.FloatTensor for argument #3 ‘index’
whene i try to change the type of ind by ind.type(tornch.long), i got this error;

RuntimeError: Invalid index in gather at /opt/conda/conda-bld/pytorch_1524584710464/work/aten/src/TH/generic/THTensorMath.c:600
any one can help me?

2

Hi,

This error means that the indices contained in ind are out of bound for the indexing you’re trying to do.
Have you checked these values?

3

how can the indices be out of bounds?
the shapes of the tensors are correct to do gather, and values in ind are the result of a series of convolutions and max pooling, i cant change theme.

4

If your dimension is of size 783456, then the indices have to be in [0, 783455]`.
Just like if you have a python list with 10 elements, you can’t access the 20th.

5

tanks,
you are right, i had make some modifications, wich change the nember of inputs, so the indices must be changed also
thank you very mutch. i have found the solution