[Fix] Remove hard requirements of pandas

processing_interns1_pro.py

@@ -173,7 +173,7 @@ class InternS1ProProcessor(ProcessorMixin):
                     raise ImportError("Please install soundfile to process audio files.")
                 ts_input, sr = sf.read(ts_path) # ts_input: np.ndarray, shape [T] or [T, C]
             elif ext == ".csv":
-                import pandas as pd
+                pd = __import__("pandas")
                 df = pd.read_csv(ts_path, header=None)
                 ts_input = df.values  # [T, C]
             elif ext == ".npy":