Update PxCorpus.py

PxCorpus.py

@@ -36,8 +36,6 @@ of 55 participants (38% non-experts, 25% doctors, 36% medical practitioners), ma
 
 _URL = "https://zenodo.org/record/6524162/files/pxslu.zip?download=1"
 
-_VOCAB = StringIndex(vocab=open("./vocabulary_nachos_lowercased.txt","r").read().split("\n"))
-
 class StringIndex:
 
     def __init__(self, vocab):
@@ -63,6 +61,8 @@ class StringIndex:
     def find(self, term):
         return term in self.vocab_struct[(term[0], len(term))]
 
+_VOCAB = StringIndex(vocab=open("./vocabulary_nachos_lowercased.txt","r").read().split("\n"))
+
 class PxCorpus(datasets.GeneratorBasedBuilder):
 
     BUILDER_CONFIGS = [