cleaning up

llms/mlx_lm/lora.py

@@ -66,7 +66,6 @@ CONFIG_DEFAULTS = {
     "lora_parameters": {"rank": 8, "alpha": 16, "dropout": 0.0, "scale": 10.0},
     "beta": 0.1,
     "dpo_loss_type": "sigmoid",
-    "is_reference_free": False,
     "delta": 50.0,
     "reference_model_path": None,
     "reward_scaling": 1.0,
@@ -174,13 +173,21 @@ def build_parser():
         help="Use gradient checkpointing to reduce memory use.",
         default=None,
     )
-    parser.add_argument("--beta", type=float)
-    parser.add_argument("--dpo-loss-type", type=str, choices=["sigmoid", "hinge", "ipo", "dpo"])
-    parser.add_argument("--is-reference-free", action="store_true")
-    parser.add_argument("--delta", type=float)
-    parser.add_argument("--reference-model-path", type=str)
-    parser.add_argument("--reward-scaling", type=float, help="Scaling factor for offline rewards.")
     parser.add_argument("--seed", type=int, help="The PRNG seed.")
+
+    # ORPO args
+    parser.add_argument(
+        "--beta",
+        type=float,
+        help="Temperature parameter for ORPO training.",
+        default=0.1
+    )
+    parser.add_argument(
+        "--reward-scaling",
+        type=float,
+        help="Reward scaling factor for ORPO training, not implemented.",
+        default=1.0
+    )
     return parser
 
 
@@ -239,7 +246,8 @@ def train_model(
             adapter_file=adapter_file,
             max_seq_length=args.max_seq_length,
             grad_checkpoint=args.grad_checkpoint,
-            beta=args.beta
+            beta=args.beta,
+            reward_scaling=args.reward_scaling
         )
             
         train_orpo(
@@ -288,7 +296,7 @@ def evaluate_model(args, model: nn.Module, tokenizer: TokenizerWrapper, test_set
             max_seq_length=args.max_seq_length,
             beta=args.beta
         )
-        print(f"Test loss {test_loss:.8f}, Rewards: {test_rewards[0]:.3f}, {test_rewards[1]:.3f}")
+        print(f"Test loss {test_loss:.3f}, Rewards: {test_rewards[0]:.3f}, {test_rewards[1]:.3f}")
     else:
         test_loss = evaluate(
             model=model,

llms/mlx_lm/tuner/orpo_trainer.py

@@ -16,6 +16,10 @@ class ORPOTrainingArgs(TrainingArgs):
         default=0.1,
         metadata={"help": "Temperature parameter for ORPO training."}
     )
+    reward_scaling: float = field(
+        default=1.0,
+        metadata={"help": "Reward scaling factor for ORPO training, not implemented."}
+    )
 
 
 def orpo_loss(model, chosen, rejected, chosen_masks, rejected_masks, preference_scores, beta=0.1):
@@ -131,7 +135,7 @@ def evaluate_orpo(model, dataset, batch_size, num_batches, beta: float, max_seq_
         ),
     ):
         chosen, rejected, chosen_masks, rejected_masks, preference_scores = batch
-        loss, reward, toks, metrics = orpo_loss(
+        lvalue, reward, toks, metrics = orpo_loss(
             model=model,
             chosen=chosen,
             rejected=rejected,
@@ -140,7 +144,7 @@ def evaluate_orpo(model, dataset, batch_size, num_batches, beta: float, max_seq_
             preference_scores=preference_scores,
             beta=beta
         )
-        all_losses += loss * toks
+        all_losses += lvalue * toks
         all_rewards += reward * toks
         ntokens += toks
         
@@ -169,6 +173,7 @@ def train_orpo(
     optimizer,
     train_dataset,
     val_dataset,
+    loss: callable = orpo_loss,
     args: ORPOTrainingArgs = ORPOTrainingArgs(),
     training_callback: TrainingCallback = None,
 ):
@@ -188,7 +193,7 @@ def train_orpo(
     def step(batch):
         chosen, rejected, chosen_masks, rejected_masks, preference_scores = batch
         
-        (loss, reward, toks, metrics), grad = loss_value_and_grad(
+        (lvalue, reward, toks, metrics), grad = loss_value_and_grad(
             model, 
             chosen, 
             rejected, 
@@ -200,10 +205,10 @@ def train_orpo(
         grad = average_gradients(grad)
         optimizer.update(model, grad)
 
-        return loss, reward, toks, metrics
+        return lvalue, reward, toks, metrics
 
     def loss_wrapper(model, chosen, rejected, chosen_masks, rejected_masks, preference_scores):
-        return orpo_loss(
+        return loss(
             model=model,
             chosen=chosen,
             rejected=rejected,
@@ -254,7 +259,7 @@ def train_orpo(
             if rank == 0:
                 print(
                     f"Iter {it}: "
-                    f"Val loss {val_loss:.8f}, "
+                    f"Val loss {val_loss:.3f}, "
                     f"Val chosen reward {val_rewards[0]:.3f}, "
                     f"Val rejected reward {val_rewards[1]:.3f}, "
                     f"Val accuracy {val_metrics['accuracies']:.3f}, "
@@ -276,13 +281,15 @@ def train_orpo(
             start = time.perf_counter()
 
         # Training step
-        loss, reward, toks, metrics = step(batch)
+        lvalue, reward, toks, metrics = step(batch)
-        losses += loss
+        losses += lvalue
         rewards += reward
         n_tokens += toks
         steps += 1
+
         for k, v in metrics.items():
             accumulated_metrics[k] += v
+
         mx.eval(state, losses, rewards, n_tokens)
 
         if it % args.steps_per_report == 0 or it == args.iters:
@@ -300,7 +307,7 @@ def train_orpo(
             
             if rank == 0:
                 print(
-                    f"Iter {it}: Train loss {train_loss:.8f}, "
+                    f"Iter {it}: Train loss {train_loss:.3f}, "
                     f"Chosen reward {train_rewards[0]:.3f}, "
                     f"Rejected reward {train_rewards[1]:.3f}, "
                     f"Accuracy {avg_metrics['accuracies']:.3f}, "