Fix typo

experiments/language_model/README.md

@@ -2,7 +2,7 @@
 
 ## Data
 
-We use [wiki103](https://s3.amazonaws.com/research.metamind.io/wikitext/wikitext-103-v1.zip) data as example, which is publicly available. It contains three text files, `train.txt`, `valid.txt` and `text.txt`. We use `train.txt` to train the model and `valid.txt` to evalute the intermeidate checkpoints. We first need to run `prepara_data.py` to tokenize these text files. We concatenate all documents into a single text and split it into lines of tokens, while each line has at most 510 token (2 tokens are left to special tokens `[CLS]` and `[SEP]`). 
+We use [wiki103](https://s3.amazonaws.com/research.metamind.io/wikitext/wikitext-103-v1.zip) data as example, which is publicly available. It contains three text files, `train.txt`, `valid.txt` and `text.txt`. We use `train.txt` to train the model and `valid.txt` to evalute the intermeidate checkpoints. We first need to run `prepare_data.py` to tokenize these text files. We concatenate all documents into a single text and split it into lines of tokens, while each line has at most 510 token (2 tokens are left to special tokens `[CLS]` and `[SEP]`). 
 
 ## Pre-training with Masked Language Modeling task