set fp16 to false if bf16, update bf16: auto in example YAMLs (#1122) [skip ci]

* set fp16 to false if bf16, update bf16: auto in example YAMLs

* unset fp16 so that it fallsback properly if bf16 isn't available

* Update README.md [skip-ci]

Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>

* test that bf16 disables fp16

---------

Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>

examples/falcon/config-7b-lora.yml

@@ -38,8 +38,8 @@ lr_scheduler: cosine
 learning_rate: 0.00003
 train_on_inputs: false
 group_by_length: false
-bf16: true
-fp16: false
+bf16: auto
+fp16:
 tf32: true
 gradient_checkpointing: true
 early_stopping_patience:

examples/falcon/config-7b-qlora.yml

@@ -64,8 +64,8 @@ lr_scheduler: cosine
 learning_rate: 0.0002
 train_on_inputs: false
 group_by_length: false
-bf16: true
-fp16: false
+bf16: auto
+fp16:
 tf32: true
 gradient_checkpointing: true
 # stop training after this many evaluation losses have increased in a row

examples/falcon/config-7b.yml

@@ -38,8 +38,8 @@ lr_scheduler: cosine
 learning_rate: 0.00003
 train_on_inputs: false
 group_by_length: false
-bf16: true
-fp16: false
+bf16: auto
+fp16:
 tf32: true
 gradient_checkpointing: true
 early_stopping_patience: