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BUG: Fix np.einsum errors on Power9 Linux and z/Linux.

See original GitHub issue

An array index fails on Power9 Linux and z/Linux.

PR follows this issue, but not sure that x86 will be happy with the proposed fix

Reproducing code example:

(qdev_venv) [linux1@jwoehr1 Qiskit]$ python
Python 3.6.8 (default, Jun 11 2019, 14:52:20) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy as np
>>> tensor = np.random.rand(10, 10, 10, 10)
>>> np.einsum('ijij->', tensor)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<__array_function__ internals>", line 6, in einsum
  File "/home/linux1/work/Qiskit/qdev_venv/lib64/python3.6/site-packages/numpy/core/einsumfunc.py", line 1356, in einsum
    return c_einsum(*operands, **kwargs)
ValueError: dimensions in operand 0 for collapsing index 'þ' don't match (-1419377904 != 10)
>>>

Error message:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<__array_function__ internals>", line 6, in einsum
  File "/home/linux1/work/Qiskit/qdev_venv/lib64/python3.6/site-packages/numpy/core/einsumfunc.py", line 1356, in einsum
    return c_einsum(*operands, **kwargs)
ValueError: dimensions in operand 0 for collapsing index 'þ' don't match (-1419377904 != 10)

Numpy/Python version information:

1.17.2 3.6.8 (default, Jun 11 2019, 14:52:20) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]

Issue Analytics

State:
Created 4 years ago
Comments:25 (25 by maintainers)

Top GitHub Comments

1reaction

charriscommented, Oct 19, 2019

I know that it would run on machines with unsigned characters after we fixed things before, so possibly this problem is fairly newly introduced. See original at #2398. I suspect #11095 might be related and it looks like @mattip has been looking in some of the same places.

1reaction

jwoehrcommented, Oct 14, 2019

Thank you for promising suggestion. I will work on it tomorrow.