Update NST.py

NST.py

@@ -258,6 +258,7 @@ class Nst(datasets.GeneratorBasedBuilder):
                             fields = {key: metadata[metadata_key].get(_METADATA_MAPPING[key], "") for key in data_fields}
                             fields["channels"] = 1
                             fields["file"] = fields["file"].replace(".wav", ".mp3")
+                            fields["frequency"] = 16_000
                             # Fixing some errors in the metadata
                             if "," in fields["age"]:
                                 fields["age"] = fields["age"].split(",")[0].strip()
@@ -267,6 +268,9 @@ class Nst(datasets.GeneratorBasedBuilder):
                                 fields["age"] = fields["age"].strip().split(" ")[0].strip()
                             if fields["age"].lower() in ("slethei", "ramslie") or not fields["age"].strip():
                                 fields["age"] = 0
+                            for int32_field in ("age", "number_of_recordings", "recording_session", "sheet_number", "channels", "frequency", "t0", "t1", "t2"):
+                                if not fields[int32_field].strip():
+                                    fields[int32_field] = 0
                             yield metadata_key, {
                                 "id": metadata_key,
                                 "audio": audio_dict,