Ultralytics Code Refactor https://ultralytics.com/actions (#13152)

Refactor code for speed and clarity

utils/plots.py

@@ -124,6 +124,9 @@ def butter_lowpass_filtfilt(data, cutoff=1500, fs=50000, order=5):
 
     # https://stackoverflow.com/questions/28536191/how-to-filter-smooth-with-scipy-numpy
     def butter_lowpass(cutoff, fs, order):
+        """Applies a low-pass Butterworth filter to a signal with specified cutoff frequency, sample rate, and filter
+        order.
+        """
         nyq = 0.5 * fs
         normal_cutoff = cutoff / nyq
         return butter(order, normal_cutoff, btype="low", analog=False)