added LPCNet torch implementation

Signed-off-by: Jan Buethe <jbuethe@amazon.de>

dnn/torch/lpcnet/scripts/update_checkpoints.py

@@ -0,0 +1,25 @@
+""" script for updating checkpoints with new setup entries
+
+    Use this script to update older outputs with newly introduced
+    parameters. (Saves us the trouble of backward compatibility)
+"""
+
+
+import argparse
+
+import torch
+
+parser = argparse.ArgumentParser()
+
+parser.add_argument('checkpoint_file', type=str, help='checkpoint to be updated')
+parser.add_argument('--model', type=str, help='model update', default=None)
+
+args = parser.parse_args()
+
+checkpoint = torch.load(args.checkpoint_file, map_location='cpu')
+
+# update model entry
+if type(args.model) != type(None):
+    checkpoint['setup']['lpcnet']['model'] = args.model
+
+torch.save(checkpoint, args.checkpoint_file)