Fix sample training command

README.md

@@ -295,7 +295,7 @@ Finally, call the training script:
 python3 train_openfold.py mmcif_dir/ alignment_dir/ template_mmcif_dir/ \
     2021-10-10 \ 
     --template_release_dates_cache_path mmcif_cache.json \ 
-    --precision 16 \
+    --precision bf16 \
     --gpus 8 --replace_sampler_ddp=True \
     --seed 42 \ # in multi-gpu settings, the seed must be specified
     --deepspeed_config_path deepspeed_config.json \