Instead of using dynamic thresholding, a user might want to investigate fixed thresholds.
Definition of fixed threshold should be k standard deviations away from the mean using errors. The default k value is set to 4 since this obtained the best result through experimentation.
def _fixed_threshold(errors, k=4):
"""Calculate the threshold.
The fixed threshold is defined as k standard deviations away from the mean.
Args:
errors (ndarray):
Array of errors.
Returns:
float:
Calculated threshold value.
"""
mean = errors.mean()
std = errors.std()
return mean + k * std
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