Fix issue about couldn't cast array

alt.py

@@ -233,6 +233,7 @@ class Alt(datasets.GeneratorBasedBuilder):
                     sp = line.split("\t")
 
                     _, urlid, sntid = sp[0].split(".")
+                    sntid = sntid.strip()  # Some lines have a trailing blank space: "SNT.102053.5598 " in data_fil.txt
                     if urlid not in allow_urls:
                         continue