fix typo (#1455)

docs/source/recipes/RNN-LM/librispeech/lm-training.rst

@@ -4,7 +4,7 @@ Train an RNN language model
 ======================================
 
 If you have enough text data, you can train a neural network language model (NNLM) to improve
-the WER of your E2E ASR system. This tutorial shows you how to train an RNNLM from 
+the WER of your E2E ASR system. This tutorial shows you how to train an RNNLM from
 scratch.
 
 .. HINT::
@@ -15,23 +15,23 @@ scratch.
 .. note::
 
     This tutorial is based on the LibriSpeech recipe. Please check it out for the necessary
-    python scripts for this tutorial. We use the LibriSpeech LM-corpus as the LM training set 
+    python scripts for this tutorial. We use the LibriSpeech LM-corpus as the LM training set
     for illustration purpose. You can also collect your own data. The data format is quite simple:
     each line should contain a complete sentence, and words should be separated by space.
 
-First, let's download the training data for the RNNLM. This can be done via the 
+First, let's download the training data for the RNNLM. This can be done via the
 following command:
 
 .. code-block:: bash
 
-    $ wget https://www.openslr.org/resources/11/librispeech-lm-norm.txt.gz 
+    $ wget https://www.openslr.org/resources/11/librispeech-lm-norm.txt.gz
     $ gzip -d librispeech-lm-norm.txt.gz
 
 As we are training a BPE-level RNNLM, we need to tokenize the training text, which requires a
 BPE tokenizer. This can be achieved by executing the following command:
 
 .. code-block:: bash
-    
+
     $ # if you don't have the BPE
     $ GIT_LFS_SKIP_SMUDGE=1 git clone https://huggingface.co/Zengwei/icefall-asr-librispeech-zipformer-2023-05-15
     $ cd icefall-asr-librispeech-zipformer-2023-05-15/data/lang_bpe_500
@@ -56,11 +56,11 @@ sentence length.
         --out-statistics data/lang_bpe_500/lm_data_stats.txt
 
 
-The aforementioned steps can be repeated to create a a validation set for you RNNLM. Let's say 
-you have a validation set in ``valid.txt``, you can just set ``--lm-data valid.txt`` 
+The aforementioned steps can be repeated to create a a validation set for you RNNLM. Let's say
+you have a validation set in ``valid.txt``, you can just set ``--lm-data valid.txt``
 and ``--lm-archive data/lang_bpe_500/lm-data-valid.pt`` when calling ``./local/prepare_lm_training_data.py``.
 
-After completing the previous steps, the training and testing sets for training RNNLM are ready. 
+After completing the previous steps, the training and testing sets for training RNNLM are ready.
 The next step is to train the RNNLM model. The training command is as follows:
 
 .. code-block:: bash
@@ -77,7 +77,7 @@ The next step is to train the RNNLM model. The training command is as follows:
         --use-fp16 0 \
         --tie-weights 1 \
         --embedding-dim 2048 \
-        --hidden_dim 2048 \
+        --hidden-dim 2048 \
         --num-layers 3 \
         --batch-size 300 \
         --lm-data rnn_lm/data/lang_bpe_500/sorted_lm_data.pt \
@@ -93,12 +93,3 @@ The next step is to train the RNNLM model. The training command is as follows:
 .. note::
 
     The training of RNNLM can take a long time (usually a couple of days).
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