Update README.md

README.md

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+
+```python
+import json
+import os
+from transformers.configuration_roberta import RobertaConfig
+from transformers import RobertaForMaskedLM, TFRobertaForMaskedLM
+
+DIRNAME = "./dummy-unknown"
+
+
+config = RobertaConfig(10, 20, 1, 1, 40)
+
+model = RobertaForMaskedLM(config)
+model.save_pretrained(DIRNAME)
+
+tf_model = TFRobertaForMaskedLM.from_pretrained(DIRNAME, from_pt=True)
+tf_model.save_pretrained(DIRNAME)
+
+# Tokenizer:
+
+vocab = [
+    "l",
+    "o",
+    "w",
+    "e",
+    "r",
+    "s",
+    "t",
+    "i",
+    "d",
+    "n",
+    "\u0120",
+    "\u0120l",
+    "\u0120n",
+    "\u0120lo",
+    "\u0120low",
+    "er",
+    "\u0120lowest",
+    "\u0120newer",
+    "\u0120wider",
+    "<unk>",
+]
+vocab_tokens = dict(zip(vocab, range(len(vocab))))
+merges = ["#version: 0.2", "\u0120 l", "\u0120l o", "\u0120lo w", "e r", ""]
+
+vocab_file = os.path.join(DIRNAME, "vocab.json")
+merges_file = os.path.join(DIRNAME, "merges.txt")
+with open(vocab_file, "w", encoding="utf-8") as fp:
+    fp.write(json.dumps(vocab_tokens) + "\n")
+with open(merges_file, "w", encoding="utf-8") as fp:
+    fp.write("\n".join(merges))
+```