Update tokenizers to 0.7.0-rc5 (#3705)

notebooks/01-training-tokenizers.ipynb

@@ -178,7 +178,7 @@
     "from tokenizers.pre_tokenizers import ByteLevel\n",
     "\n",
     "# First we create an empty Byte-Pair Encoding model (i.e. not trained model)\n",
-    "tokenizer = Tokenizer(BPE.empty())\n",
+    "tokenizer = Tokenizer(BPE())\n",
     "\n",
     "# Then we enable lower-casing and unicode-normalization\n",
     "# The Sequence normalizer allows us to combine multiple Normalizer that will be\n",
@@ -307,7 +307,7 @@
    ],
    "source": [
     "# Let's tokenizer a simple input\n",
-    "tokenizer.model = BPE.from_files('vocab.json', 'merges.txt')\n",
+    "tokenizer.model = BPE('vocab.json', 'merges.txt')\n",
     "encoding = tokenizer.encode(\"This is a simple input to be tokenized\")\n",
     "\n",
     "print(\"Encoded string: {}\".format(encoding.tokens))\n",

setup.py

@@ -96,7 +96,7 @@ setup(
     packages=find_packages("src"),
     install_requires=[
         "numpy",
-        "tokenizers == 0.7.0rc3",
+        "tokenizers == 0.7.0rc5",
         # dataclasses for Python versions that don't have it
         "dataclasses;python_version<'3.7'",
         # accessing files from S3 directly

src/transformers/tokenization_openai.py

@@ -265,12 +265,10 @@ class _OpenAIGPTCharBPETokenizer(BaseTokenizer):
     ):
         if vocab_file is not None and merges_file is not None:
             tokenizer = Tokenizer(
-                BPE.from_files(
-                    vocab_file, merges_file, dropout=dropout, unk_token=unk_token, end_of_word_suffix=suffix
-                )
+                BPE(vocab_file, merges_file, dropout=dropout, unk_token=unk_token, end_of_word_suffix=suffix)
             )
         else:
-            tokenizer = Tokenizer(BPE.empty())
+            tokenizer = Tokenizer(BPE())
 
         # Check for Unicode normalization first (before everything else)
         normalizers = []

src/transformers/tokenization_transfo_xl.py

@@ -362,7 +362,7 @@ class _TransfoXLDelimiterLookupTokenizer(BaseTokenizer):
     ):
 
         try:
-            tokenizer = WordLevel.from_files(vocab_file, unk_token=unk_token)
+            tokenizer = WordLevel(vocab_file, unk_token=unk_token)
             tokenizer = Tokenizer(tokenizer)
         except Exception:
             raise ValueError(