Remove unused train_masked_language_model helper (#1452)

Summary: Pull Request resolved: fairinternal/fairseq-py#1452

Test Plan: Imported from OSS

Reviewed By: lematt1991

Differential Revision: D25108462

Pulled By: myleott

fbshipit-source-id: 3c17a9937a4c3edb69f64130dfd866c5f42a4aaf

tests/test_binaries.py

@@ -1673,71 +1673,5 @@ def eval_lm_main(data_dir, extra_flags=None):
     eval_lm.main(eval_lm_args)
 
 
-def train_masked_language_model(data_dir, arch, extra_args=()):
-    train_parser = options.get_training_parser()
-    # TODO: langs should be in and out right?
-    train_args = options.parse_args_and_arch(
-        train_parser,
-        [
-            "--task",
-            "cross_lingual_lm",
-            data_dir,
-            "--arch",
-            arch,
-            # Optimizer args
-            "--optimizer",
-            "adam",
-            "--lr-scheduler",
-            "reduce_lr_on_plateau",
-            "--lr-shrink",
-            "0.5",
-            "--lr",
-            "0.0001",
-            "--min-lr",
-            "1e-09",
-            # dropout, attention args
-            "--dropout",
-            "0.1",
-            "--attention-dropout",
-            "0.1",
-            # MLM args
-            "--criterion",
-            "masked_lm_loss",
-            "--masked-lm-only",
-            "--monolingual-langs",
-            "in,out",
-            "--num-segment",
-            "5",
-            # Transformer args: use a small transformer model for fast training
-            "--encoder-layers",
-            "1",
-            "--encoder-embed-dim",
-            "32",
-            "--encoder-attention-heads",
-            "1",
-            "--encoder-ffn-embed-dim",
-            "32",
-            # Other training args
-            "--max-tokens",
-            "500",
-            "--tokens-per-sample",
-            "500",
-            "--save-dir",
-            data_dir,
-            "--max-epoch",
-            "1",
-            "--no-progress-bar",
-            "--distributed-world-size",
-            "1",
-            "--dataset-impl",
-            "raw",
-            "--num-workers",
-            "0",
-        ]
-        + list(extra_args),
-    )
-    train.main(train_args)
-
-
 if __name__ == "__main__":
     unittest.main()