Pin s2s-ft to a fixed commit.
"```\n",
"conda activate nlp_gpu\n",
"git clone https://github.com/microsoft/unilm.git\n",
+ "git checkout 7f931fcfb965bf60f0fbe2ddd37798f356e6ee5e\n",
"cd unilm/s2s-ft\n",
"pip install -e .\n",
"```"
