Fix specgram test on NumPy 1.20.#19371
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In NumPy 1.20, the fft is slight different (more accurate?) and returns 0 as the last entry, instead of some small number ~1e-30. This causes a divide-by-zero warning in `log10`. However, this test doesn't really care about the spectrogram, just the frequencies, so we can change the scale to linear to avoid the warning.
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…371-on-v3.3.x Backport PR #19371 on branch v3.3.x (Fix specgram test on NumPy 1.20.)
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PR Summary
In NumPy 1.20, the fft is slightly different (more accurate?) and returns 0 as the last entry, instead of some small number ~1e-30. This causes a divide-by-zero warning in
log10. However, this test doesn't really care about the spectrogram, just the frequencies, so we can change the scale to linear to avoid the warning.PR Checklist
pytestpasses).flake8on changed files to check).flake8-docstringsand runflake8 --docstring-convention=all).doc/users/next_whats_new/(follow instructions in README.rst there).doc/api/next_api_changes/(follow instructions in README.rst there).