Update custom model files, README, and requirements

alignment.py

@@ -4,9 +4,9 @@ import numpy as np
 import torch
 
 # Offset compensation for Wav2Vec2-BASE systematic bias (in seconds)
-# Calibrated on librispeech-alignments dataset (n=25, Median AE=20ms)
-START_OFFSET = 0.03  # Subtract from start times (shift earlier)
-END_OFFSET = -0.03  # Subtract from end times (shift earlier)
+# Calibrated on librispeech-alignments dataset (n=25, MAE=48ms)
+START_OFFSET = 0.04  # Subtract from start times (shift earlier)
+END_OFFSET = -0.04  # Subtract from end times (shift later)
 
 
 def _get_device() -> str: