Update text_sentiment_ngrams_tutorial.py (#2246)

Fixes #2245

Author: Svetlana Karslioglu

beginner_source/text_sentiment_ngrams_tutorial.py

@@ -148,7 +148,7 @@ class TextClassificationModel(nn.Module):
 
     def __init__(self, vocab_size, embed_dim, num_class):
         super(TextClassificationModel, self).__init__()
-        self.embedding = nn.EmbeddingBag(vocab_size, embed_dim, sparse=True)
+        self.embedding = nn.EmbeddingBag(vocab_size, embed_dim, sparse=False)
         self.fc = nn.Linear(embed_dim, num_class)
         self.init_weights()