Remove unused import

Signed-off-by: Tim Moon <[email protected]>

nemo/collections/nlp/models/language_modeling/megatron_gpt_model.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import itertools
-from typing import Any, Dict, List, Optional, Union
+from typing import Any, List, Optional, Union
 
 import numpy as np
 import torch