Ensure labels are a list before calling the c++ api

Author: Sean Naren

ctcdecode/__init__.py

@@ -9,7 +9,7 @@ def __init__(self, labels, model_path=None, alpha=0, beta=0, cutoff_top_n=40, cu
         self._beam_width = beam_width
         self._scorer = None
         self._num_processes = num_processes
-        self._labels = labels
+        self._labels = list(labels)  # Ensure labels are a list
         self._num_labels = len(labels)
         self._blank_id = blank_id
         self._log_probs = 1 if log_probs_input else 0