Fix typo

Author: p16i

beginner_source/text_sentiment_ngrams_tutorial.py

@@ -110,8 +110,8 @@ def forward(self, text, offsets):
 
 VOCAB_SIZE = len(train_dataset.get_vocab())
 EMBED_DIM = 32
-NUN_CLASS = len(train_dataset.get_labels())
-model = TextSentiment(VOCAB_SIZE, EMBED_DIM, NUN_CLASS).to(device)
+NUM_CLASS = len(train_dataset.get_labels())
+model = TextSentiment(VOCAB_SIZE, EMBED_DIM, NUM_CLASS).to(device)
 
 
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