Enable dropout = 0.0 as an equivalent to none in BPE (#1550)

* enable dropout = 0.0

* typo

* lint

* formatter

* enable dropout = 0.0

* formatter

bindings/python/tests/bindings/test_models.py

@@ -69,6 +69,10 @@ class TestBPE:
         model.byte_fallback = True
         assert model.byte_fallback == True
 
+    def test_dropout_zero(self):
+        model = BPE(dropout=0.0)
+        assert model.dropout == 0.0
+
 
 class TestWordPiece:
     def test_instantiate(self, bert_files):