question: Trainer flags: amp_level vs. precision
context: Hi!
  I'm a bit confused regarding the trainer's flags. According to Lightning's documentation, the default settings are:
  
  amp_level='O2'  (i.e., "Almost FP16" Mixed Precision, cf. Nvidia documentation)
  precision=32
  
  Isn't it a bit contradictory ? Is the default training mode full precision or mixed precision?
  Thanks in advance for your clarification :)
answer: Dear @dianemarquette,
  precision=32 is the default one. However, if you turn on precision=16 and set amp_backend="apex", then amp_level=02 is considered as the default one.
  Best,
  T.C