From 75b54eecc28d718d5a61e6988c1e533f0bd00329 Mon Sep 17 00:00:00 2001
From: Yukio Siraichi <yukio.siraichi@gmail.com>
Date: Sat, 17 Feb 2024 14:09:57 -0300
Subject: [PATCH] [benchmarks] Fix AMP data-type. (#6550)

---
 benchmarks/torchbench_model.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/benchmarks/torchbench_model.py b/benchmarks/torchbench_model.py
index d3f644b4b73..a01344dd558 100644
--- a/benchmarks/torchbench_model.py
+++ b/benchmarks/torchbench_model.py
@@ -383,8 +383,16 @@ def conversion_dtype(self):
     return torch.bfloat16
 
   def _get_autocast_with_kwargs(self):
+    kwargs = {}
+
+    # Set the default data-type based on the accelerator.
+    if self.benchmark_experiment.accelerator == "cuda":
+      kwargs["dtype"] = torch.float16
+    else:
+      # Both CPU and TPU autocast mode defaults to bfloat16.
+      kwargs["dtype"] = torch.bfloat16
+
     if self.use_amp():
-      kwargs = {"dtype": torch.bfloat16}
       if self.benchmark_experiment.xla:
         # Should call device specific autocast implementations.
         # PyTorch/XLA autocast does not run with dynamo, though:
@@ -394,7 +402,6 @@ def _get_autocast_with_kwargs(self):
       else:
         autocast = torch.cuda.amp.autocast
     else:
-      kwargs = {}
       autocast = contextlib.nullcontext
     return (autocast, kwargs)