Ignore tokens per sec from jit_compile iteration (pytorch#1378)

* Remove tokens per sec in aggregate_metrics when jit_compile

* Add warning to user

* Update

---------

Co-authored-by: Jack-Khuu <jack.khuu.7@gmail.com>

Author: yanbing-j

torchchat/generate.py

@@ -1149,9 +1149,11 @@ def callback(x, *, done_generating=False):
                 print(
                     f"just-in-time compilation time (incl run time): {compilation_time:.2} seconds"
                 )
-            aggregate_metrics["tokens_per_sec"].append(tokens_sec)
-            aggregate_metrics["first_token_per_sec"].append(first_token_sec)
-            aggregate_metrics["next_tokens_per_sec"].append(next_tokens_sec)
+            else:
+                # aggregate_metrics will not append when is jit_compile, which will affect the average numbers.
+                aggregate_metrics["tokens_per_sec"].append(tokens_sec)
+                aggregate_metrics["first_token_per_sec"].append(first_token_sec)
+                aggregate_metrics["next_tokens_per_sec"].append(next_tokens_sec)
 
             logging.info(
                 f"\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\
@@ -1205,7 +1207,8 @@ def callback(x, *, done_generating=False):
             or torch.isnan(torch.tensor(avg_next_tokens_sec))
         ):
             print(
-                f"\n      Average tokens/sec (total): {avg_tokens_sec:.2f} \
+                f"\nWarning: Excluding compile in calculations \
+                \n      Average tokens/sec (total): {avg_tokens_sec:.2f} \
                 \nAverage tokens/sec (first token): {avg_first_token_sec:.2f} \
                 \nAverage tokens/sec (next tokens): {avg_next_tokens_sec:.2f} \n\
                 "