remove unuse import (NVIDIA#340)

Signed-off-by: folivoramanh <palasek182@gmail.com>
Signed-off-by: Mariana Graterol Fuenmayor <marianag@nvidia.com>
Signed-off-by: Mai Anh <palasek182@gmail.com>

Author: folivoramanh

nemo_text_processing/text_normalization/vi/taggers/ordinal.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import pynini
 from pynini.lib import pynutil
 

nemo_text_processing/text_normalization/vi/verbalizers/money.py

@@ -18,7 +18,6 @@
 from nemo_text_processing.text_normalization.vi.graph_utils import (
     NEMO_COMMA_VI,
     NEMO_NOT_QUOTE,
-    NEMO_SPACE,
     GraphFst,
     delete_preserve_order,
     delete_space,

nemo_text_processing/text_normalization/vi/verbalizers/roman.py

@@ -15,7 +15,7 @@
 import pynini
 from pynini.lib import pynutil
 
-from nemo_text_processing.text_normalization.vi.graph_utils import NEMO_NOT_QUOTE, NEMO_SIGMA, GraphFst, delete_space
+from nemo_text_processing.text_normalization.vi.graph_utils import NEMO_NOT_QUOTE, GraphFst, delete_space
 
 
 class RomanFst(GraphFst):