diff --git a/dygraph/pbt_lm/args.py b/dygraph/ptb_lm/args.py
similarity index 100%
rename from dygraph/pbt_lm/args.py
rename to dygraph/ptb_lm/args.py
diff --git a/dygraph/pbt_lm/data/download_data.sh b/dygraph/ptb_lm/data/download_data.sh
similarity index 100%
rename from dygraph/pbt_lm/data/download_data.sh
rename to dygraph/ptb_lm/data/download_data.sh
diff --git a/dygraph/pbt_lm/debug.sh b/dygraph/ptb_lm/debug.sh
similarity index 100%
rename from dygraph/pbt_lm/debug.sh
rename to dygraph/ptb_lm/debug.sh
diff --git a/dygraph/pbt_lm/ptb_dy.py b/dygraph/ptb_lm/ptb_dy.py
similarity index 100%
rename from dygraph/pbt_lm/ptb_dy.py
rename to dygraph/ptb_lm/ptb_dy.py
diff --git a/dygraph/pbt_lm/reader.py b/dygraph/ptb_lm/reader.py
similarity index 100%
rename from dygraph/pbt_lm/reader.py
rename to dygraph/ptb_lm/reader.py