Speed up Model tests by 20% (#5574)

* Measuring execution times of models.

* Speed up models by avoiding re-estimation of eager output

* Fixing linter

* Reduce input size for big models

* Speed up jit check method.

* Add simple jitscript fallback check for flaky models.

* Restore pytest filtering

* Fixing linter

test/test_models.py

@@ -4,7 +4,6 @@ import operator
 import os
 import pkgutil
 import sys
-import traceback
 import warnings
 from collections import OrderedDict
 from tempfile import TemporaryDirectory
@@ -119,12 +118,9 @@ def _assert_expected(output, name, prec=None, atol=None, rtol=None):
         torch.testing.assert_close(output, expected, rtol=rtol, atol=atol, check_dtype=False)
 
 
-def _check_jit_scriptable(nn_module, args, unwrapper=None, skip=False):
+def _check_jit_scriptable(nn_module, args, unwrapper=None, skip=False, eager_out=None):
     """Check that a nn.Module's results in TorchScript match eager and that it can be exported"""
 
-    def assert_export_import_module(m, args):
-        """Check that the results of a model are the same after saving and loading"""
-
     def get_export_import_copy(m):
         """Save and load a TorchScript model"""
         with TemporaryDirectory() as dir:
@@ -133,14 +129,6 @@ def _check_jit_scriptable(nn_module, args, unwrapper=None, skip=False):
             imported = torch.jit.load(path)
         return imported
 
-        m_import = get_export_import_copy(m)
-        with torch.no_grad(), freeze_rng_state():
-            results = m(*args)
-        with torch.no_grad(), freeze_rng_state():
-            results_from_imported = m_import(*args)
-        tol = 3e-4
-        torch.testing.assert_close(results, results_from_imported, atol=tol, rtol=tol)
-
     TEST_WITH_SLOW = os.getenv("PYTORCH_TEST_WITH_SLOW", "0") == "1"
     if not TEST_WITH_SLOW or skip:
         # TorchScript is not enabled, skip these tests
@@ -157,7 +145,9 @@ def _check_jit_scriptable(nn_module, args, unwrapper=None, skip=False):
 
     sm = torch.jit.script(nn_module)
 
+    if eager_out is None:
         with torch.no_grad(), freeze_rng_state():
+            if unwrapper:
                 eager_out = nn_module(*args)
 
     with torch.no_grad(), freeze_rng_state():
@@ -166,14 +156,22 @@ def _check_jit_scriptable(nn_module, args, unwrapper=None, skip=False):
             script_out = unwrapper(script_out)
 
     torch.testing.assert_close(eager_out, script_out, atol=1e-4, rtol=1e-4)
-    assert_export_import_module(sm, args)
+
+    m_import = get_export_import_copy(sm)
+    with torch.no_grad(), freeze_rng_state():
+        imported_script_out = m_import(*args)
+        if unwrapper:
+            imported_script_out = unwrapper(imported_script_out)
+
+    torch.testing.assert_close(script_out, imported_script_out, atol=3e-4, rtol=3e-4)
 
 
-def _check_fx_compatible(model, inputs):
+def _check_fx_compatible(model, inputs, eager_out=None):
     model_fx = torch.fx.symbolic_trace(model)
-    out = model(inputs)
-    out_fx = model_fx(inputs)
-    torch.testing.assert_close(out, out_fx)
+    if eager_out is None:
+        eager_out = model(inputs)
+    fx_out = model_fx(inputs)
+    torch.testing.assert_close(eager_out, fx_out)
 
 
 def _check_input_backprop(model, inputs):
@@ -298,6 +296,24 @@ _model_params = {
         "rpn_post_nms_top_n_test": 1000,
     },
 }
+# speeding up slow models:
+slow_models = [
+    "convnext_base",
+    "convnext_large",
+    "resnext101_32x8d",
+    "wide_resnet101_2",
+    "efficientnet_b6",
+    "efficientnet_b7",
+    "efficientnet_v2_m",
+    "efficientnet_v2_l",
+    "regnet_y_16gf",
+    "regnet_y_32gf",
+    "regnet_y_128gf",
+    "regnet_x_16gf",
+    "regnet_x_32gf",
+]
+for m in slow_models:
+    _model_params[m] = {"input_shape": (1, 3, 64, 64)}
 
 
 # The following contains configuration and expected values to be used tests that are model specific
@@ -564,8 +580,8 @@ def test_classification_model(model_fn, dev):
     out = model(x)
     _assert_expected(out.cpu(), model_name, prec=0.1)
     assert out.shape[-1] == num_classes
-    _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None))
-    _check_fx_compatible(model, x)
+    _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None), eager_out=out)
+    _check_fx_compatible(model, x, eager_out=out)
 
     if dev == torch.device("cuda"):
         with torch.cuda.amp.autocast():
@@ -595,7 +611,7 @@ def test_segmentation_model(model_fn, dev):
     model.eval().to(device=dev)
     # RNG always on CPU, to ensure x in cuda tests is bitwise identical to x in cpu tests
     x = torch.rand(input_shape).to(device=dev)
-    out = model(x)["out"]
+    out = model(x)
 
     def check_out(out):
         prec = 0.01
@@ -615,17 +631,17 @@ def test_segmentation_model(model_fn, dev):
 
         return True  # Full validation performed
 
-    full_validation = check_out(out)
+    full_validation = check_out(out["out"])
 
-    _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None))
-    _check_fx_compatible(model, x)
+    _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None), eager_out=out)
+    _check_fx_compatible(model, x, eager_out=out)
 
     if dev == torch.device("cuda"):
         with torch.cuda.amp.autocast():
-            out = model(x)["out"]
+            out = model(x)
             # See autocast_flaky_numerics comment at top of file.
             if model_name not in autocast_flaky_numerics:
-                full_validation &= check_out(out)
+                full_validation &= check_out(out["out"])
 
     if not full_validation:
         msg = (
@@ -716,7 +732,7 @@ def test_detection_model(model_fn, dev):
         return True  # Full validation performed
 
     full_validation = check_out(out)
-    _check_jit_scriptable(model, ([x],), unwrapper=script_model_unwrapper.get(model_name, None))
+    _check_jit_scriptable(model, ([x],), unwrapper=script_model_unwrapper.get(model_name, None), eager_out=out)
 
     if dev == torch.device("cuda"):
         with torch.cuda.amp.autocast():
@@ -780,8 +796,8 @@ def test_video_model(model_fn, dev):
     # RNG always on CPU, to ensure x in cuda tests is bitwise identical to x in cpu tests
     x = torch.rand(input_shape).to(device=dev)
     out = model(x)
-    _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None))
-    _check_fx_compatible(model, x)
+    _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None), eager_out=out)
+    _check_fx_compatible(model, x, eager_out=out)
     assert out.shape[-1] == 50
 
     if dev == torch.device("cuda"):
@@ -821,8 +837,13 @@ def test_quantized_classification_model(model_fn):
     if model_name not in quantized_flaky_models:
         _assert_expected(out, model_name + "_quantized", prec=0.1)
         assert out.shape[-1] == 5
-        _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None))
-        _check_fx_compatible(model, x)
+        _check_jit_scriptable(model, (x,), unwrapper=script_model_unwrapper.get(model_name, None), eager_out=out)
+        _check_fx_compatible(model, x, eager_out=out)
+    else:
+        try:
+            torch.jit.script(model)
+        except Exception as e:
+            raise AssertionError("model cannot be scripted.") from e
 
     kwargs["quantize"] = False
     for eval_mode in [True, False]:
@@ -843,12 +864,6 @@ def test_quantized_classification_model(model_fn):
 
         torch.ao.quantization.convert(model, inplace=True)
 
-    try:
-        torch.jit.script(model)
-    except Exception as e:
-        tb = traceback.format_exc()
-        raise AssertionError(f"model cannot be scripted. Traceback = {str(tb)}") from e
-
 
 @pytest.mark.parametrize("model_fn", get_models_from_module(models.detection))
 def test_detection_model_trainable_backbone_layers(model_fn, disable_weight_loading):