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pythonnumpypytorch

TypeError: can't convert np.ndarray of type numpy.object_

How to convert a numpy array of dtype=object to torch Tensor?

array([
   array([0.5, 1.0, 2.0], dtype=float16),
   array([4.0, 6.0, 8.0], dtype=float16)
], dtype=object)
Solution

  • It is difficult to answer properly since you do not show us how you try to do it. From your error message I can see that you try to convert a numpy array containing objects to a torch tensor. This does not work, you will need a numeric data type:

    import torch
import numpy as np

# Your test array without 'dtype=object'
a = np.array([
    np.array([0.5, 1.0, 2.0], dtype=np.float16),
    np.array([4.0, 6.0, 8.0], dtype=np.float16),
])

b = torch.from_numpy(a)

print(a.dtype) # This should not be 'object'
print(b)

    Output

    float16
tensor([[0.5000, 1.0000, 2.0000],
        [4.0000, 6.0000, 8.0000]], dtype=torch.float16)