Pytorch datatype/dimension confusion TypeError: 'Tensor' object is not callable

Question

This piece of code is originally written in numpy and I'm trying to utilise GPU computation by rewriting it in pytorch, but as I'm new to pytorch a lot of problems occured to me. Firstly I'm confused by the dimension of the tensors. Sometimes after operating on the tensors, only transposing the tensor would fix the problem, is there anyway I can stop doing .t()? The major problem here is that in the line ar = torch.stack ... the error "TypeError: 'Tensor' object is not callable " occurs. Any suggestion/correction would be appreciated. Thxxx

def vec_datastr(vector):

    vector = vector.float()
    # Find the indices corresponding to non-zero entries
    index = torch.nonzero(vector)
    index = index.t()

    # Compute probability
    prob = vector ** 2
    if torch.sum(prob) == 0:
        prob = 0
    else:
        prob = prob / torch.sum(prob)

    d = depth(vector)
    CumProb = torch.ones((2**d-len(prob.t()),1), device ='cuda')
    cp = torch.cumsum(prob, dim=0)
    cp = cp.reshape((len(cp.t()),1))
    CumProb = torch.cat((cp, CumProb),0)
    vector = vector.t()
    prob = prob.t()

    ar = torch.stack((index, vector([index,1]), prob([index, 1]), CumProb([index, 1]))) # Problems occur here
    ar = ar.reshape((len(index), 4))

    # Store the data as a 4-dimensional array
    output = dict()
    output = {'index':ar[:,0], 'value': ar[:,1], 'prob':ar[:,2], 'CumProb': ar[:,3]}

    return output

Szymon Maszke · Accepted Answer · 2020-10-26 23:58:29Z

1

ar = torch.stack(
    (index, vector([index, 1]), prob([index, 1]), CumProb([index, 1]))
)  # Problems occur here

vector is of type torch.Tensor. It has no __call__ defined. You are going for vector(...) (vector([index,1])) while you should slice the data directly like this: vector[index, 1]. Same goes for prob and CumProb.

Somehow, you do it correctly for ar with ar[:,0] so it might be a typo

edited Oct 26, 2020 at 23:58

answered Oct 26, 2020 at 9:36

Szymon Maszke

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