View size is not compatible with input tensor's size and stride

1

i edited .view() to .reshape() but same error still occured…

def accuracy(output, target, topk=(1,)):
  maxk = max(topk)
  batch_size = target.size(0)

  _, pred = output.topk(maxk, 1, True, True)
  pred = pred.t()
  correct = pred.eq(target.view(1, -1).expand_as(pred))

  res = []
  for k in topk:
    correct_k = correct[:k].reshape(-1).float().sum(0)
    res.append(correct_k.mul_(100.0/batch_size))
  return res

full error sentence:
RuntimeError: view size is not compatible with input tensor’s size and stride (at least one dimension spans across two contiguous subspaces). Use .reshape(…) instead.

i don’t know why it still cry an error like this…

2

The posted error is raised, if the tensor it not contiguous in memory and thus view will fail.
You could either use .reshape instead as suggested in the error message or .contiguous().view(...) alternatively.

5 Likes
3

thank you! ptrblck!
reshape doesn’t work for me but .contiguous() works! :smiley:

4

Thank you @ptrblck, it works

5

Neither .contiguous().view(…) nor .reshape(…) is working. I am using google colab. How to make it work?

def accuracy(output, target, topk=(1,)):
maxk = max(topk)
batch_size = target.size(0)

_, pred = output.topk(maxk, 1, True, True)
pred = pred.t()
correct = pred.eq(target.view(1, -1).expand_as(pred))
print(correct.shape)

res =
for k in topk:
correct_k = correct[:k].reshape(-1).float().sum(0)
res.append(correct_k.mul_(100.0/batch_size))
return res

6

What exactly does not work?
You would need to explain your issues with more details as your post shows code, which is neither properly formatted nor executable.

7

I am calling the same function i.e. accuracy(output, target, topk=(1,)); and same runtime error is reported as that reported by tree5680:

I checked with both changes i.e. .view(…) to .reshape(…) and .view(…) to .contiguous().view(…)

1
11645×214 39.7 KB

8

Could you post a minimal and executable code snippet reproducing the issue as I cannot trigger the error using:

pred = torch.randint(0, 2, (10, 10,))
target = torch.randint(0, 2, (1, 10))

correct = pred.eq(target.view(1, -1).expand_as(pred))
print(correct.shape)
# torch.Size([10, 10])

k = 3
correct_k = correct[:k].reshape(-1).float().sum(0)
print(correct_k)
# tensor(15.)
9

prec1, prec5 = utils.accuracy(logits, target, topk=(1, 5))
print(prec1)

tensor(9.3750, device=‘cuda:0’)

print(prec5)

tensor(43.7500, device=‘cuda:0’)

Thank you very much ptrblck for your time. I tried with another google account to use google colab, and surprisingly, both the alternatives of .view() as suggested by you worked.

Regards,
abhiskl