Update PxCorpus.py

PxCorpus.py

@@ -63,8 +63,6 @@ class StringIndex:
 
 class PxCorpus(datasets.GeneratorBasedBuilder):
 
-    VOCAB = StringIndex(vocab=open("./vocabulary_nachos_lowercased.txt","r").read().split("\n"))
-
     BUILDER_CONFIGS = [
         datasets.BuilderConfig(name=f"default", version="1.0.0", description=f"PxCorpus data"),
     ]
@@ -139,6 +137,8 @@ class PxCorpus(datasets.GeneratorBasedBuilder):
 
     def getTokenTags(self, document):
 
+        VOCAB = StringIndex(vocab=open("./vocabulary_nachos_lowercased.txt","r").read().split("\n"))
+
         tokens = []
         ner_tags = []
         is_oov = []