Performance improvements: Reduce memory usage #22
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Reduce memory usage of resample with chunking & memmap.
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Reduce memory usage of lowpass_hz with chunking & memmap. BREAKING CHANGE: No longer resamples the signal as it's too expensive.
Reduce memory usage with chunking & memmap.
Unextract process() call to reduce obj ref count to reduce mem usage.
Use subsampled stationary_indicator to reduce memory usage. BREAKING CHANGE: subsampled stationary_indicator produces marginally different results.
More careful mmap to frame conversion to reduce memory usage. BREAKING CHANGE: Drop fix_nonincr_time as too expensive and it's almost never applicable. TODO: Do this from the parser?
Use subsampled stationary_indicator to reduce memory usage. BREAKING CHANGE: Subsampled stationary_indicator gives marginally different results.
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