From f894dfecfaa3ec17903b2ac37ac4f071408613db Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Fri, 17 Feb 2023 21:06:11 +0100
Subject: Added Lion optimizer

---
 train_lora.py | 38 +++++++++++++++++++++++++++-----------
 1 file changed, 27 insertions(+), 11 deletions(-)

(limited to 'train_lora.py')

diff --git a/train_lora.py b/train_lora.py
index 330bcd6..368c29b 100644
--- a/train_lora.py
+++ b/train_lora.py
@@ -245,9 +245,10 @@ def parse_args():
         help="Minimum learning rate in the lr scheduler."
     )
     parser.add_argument(
-        "--use_8bit_adam",
-        action="store_true",
-        help="Whether or not to use 8-bit Adam from bitsandbytes."
+        "--optimizer",
+        type=str,
+        default="lion",
+        help='Optimizer to use ["adam", "adam8bit", "lion"]'
     )
     parser.add_argument(
         "--adam_beta1",
@@ -466,15 +467,34 @@ def main():
         args.learning_rate = 1e-6
         args.lr_scheduler = "exponential_growth"
 
-    if args.use_8bit_adam:
+    if args.optimizer == 'adam8bit':
         try:
             import bitsandbytes as bnb
         except ImportError:
             raise ImportError("To use 8-bit Adam, please install the bitsandbytes library: `pip install bitsandbytes`.")
 
-        optimizer_class = bnb.optim.AdamW8bit
+        create_optimizer = partial(
+            bnb.optim.AdamW8bit,
+            betas=(args.adam_beta1, args.adam_beta2),
+            weight_decay=args.adam_weight_decay,
+            eps=args.adam_epsilon,
+            amsgrad=args.adam_amsgrad,
+        )
+    elif args.optimizer == 'adam':
+        create_optimizer = partial(
+            torch.optim.AdamW,
+            betas=(args.adam_beta1, args.adam_beta2),
+            weight_decay=args.adam_weight_decay,
+            eps=args.adam_epsilon,
+            amsgrad=args.adam_amsgrad,
+        )
     else:
-        optimizer_class = torch.optim.AdamW
+        try:
+            from lion_pytorch import Lion
+        except ImportError:
+            raise ImportError("To use Lion, please install the lion_pytorch library: `pip install lion_pytorch`.")
+
+        create_optimizer = partial(Lion, use_triton=True)
 
     trainer = partial(
         train,
@@ -516,13 +536,9 @@ def main():
     )
     datamodule.setup()
 
-    optimizer = optimizer_class(
+    optimizer = create_optimizer(
         lora_layers.parameters(),
         lr=args.learning_rate,
-        betas=(args.adam_beta1, args.adam_beta2),
-        weight_decay=args.adam_weight_decay,
-        eps=args.adam_epsilon,
-        amsgrad=args.adam_amsgrad,
     )
 
     lr_scheduler = get_scheduler(
-- 
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