Introduce code from Rust monorepo. This is a mess

tts/nemo/collections/common/tokenizers/moses_tokenizers.py

@@ -0,0 +1,47 @@
+# Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from typing import List
+
+from sacremoses import MosesDetokenizer, MosesPunctNormalizer, MosesTokenizer
+
+
+class MosesProcessor:
+    """
+    Tokenizer, Detokenizer and Normalizer utilities in Moses
+    """
+
+    def __init__(self, lang_id: str):
+        self.moses_tokenizer = MosesTokenizer(lang=lang_id)
+        self.moses_detokenizer = MosesDetokenizer(lang=lang_id)
+        self.normalizer = MosesPunctNormalizer(lang=lang_id)
+
+    def detokenize(self, tokens: List[str]) -> str:
+        """
+        Detokenizes a list of tokens
+        Args:
+            tokens: list of strings as tokens
+        Returns:
+            detokenized string
+        """
+        return self.moses_detokenizer.detokenize(tokens)
+
+    def tokenize(self, text: str):
+        """
+        Tokenizes text using Moses -> Sentencepiece.
+        """
+        return self.moses_tokenizer.tokenize(text, escape=False, return_str=True)
+
+    def normalize(self, text: str):
+        return self.normalizer.normalize(text)