Convert model inference test from pytest to unittest (#2644)

* convert ao inference test from pytest to unittest

* refactor: `common_utils` for common parameters

* incline common params

* fix uncorrect library import

Author: namgyu-youn

test/test_ao_models.py

@@ -3,32 +3,53 @@
 #
 # This source code is licensed under the BSD 3-Clause license found in the
 # LICENSE file in the root directory of this source tree.
-import pytest
+import unittest
+
 import torch
+from torch.testing._internal import common_utils
 
 from torchao._models.llama.model import Transformer
 
-_AVAILABLE_DEVICES = ["cpu"] + (["cuda"] if torch.cuda.is_available() else [])
-
 
 def init_model(name="stories15M", device="cpu", precision=torch.bfloat16):
+    """Initialize and return a Transformer model with specified configuration."""
     model = Transformer.from_name(name)
     model.to(device=device, dtype=precision)
     return model.eval()
 
 
-@pytest.mark.parametrize("device", _AVAILABLE_DEVICES)
-@pytest.mark.parametrize("batch_size", [1, 4])
-@pytest.mark.parametrize("is_training", [True, False])
-def test_ao_llama_model_inference_mode(device, batch_size, is_training):
-    random_model = init_model(device=device)
-    seq_len = 16
-    input_ids = torch.randint(0, 1024, (batch_size, seq_len)).to(device)
-    input_pos = None if is_training else torch.arange(seq_len).to(device)
-    with torch.device(device):
-        random_model.setup_caches(
-            max_batch_size=batch_size, max_seq_length=seq_len, training=is_training
-        )
-    for i in range(3):
-        out = random_model(input_ids, input_pos)
-        assert out is not None, "model failed to run"
+class TorchAOBasicTestCase(unittest.TestCase):
+    """Test suite for basic Transformer inference functionality."""
+
+    @common_utils.parametrize(
+        "device", ["cpu", "cuda"] if torch.cuda.is_available() else ["cpu"]
+    )
+    @common_utils.parametrize("batch_size", [1, 4])
+    @common_utils.parametrize("is_training", [True, False])
+    def test_ao_inference_mode(self, device, batch_size, is_training):
+        # Initialize model with specified device
+        random_model = init_model(device=device)
+
+        # Set up test input parameters
+        seq_len = 16
+        input_ids = torch.randint(0, 1024, (batch_size, seq_len)).to(device)
+
+        # input_pos is None for training mode, tensor for inference mode
+        input_pos = None if is_training else torch.arange(seq_len).to(device)
+
+        # Setup model caches within the device context
+        with torch.device(device):
+            random_model.setup_caches(
+                max_batch_size=batch_size, max_seq_length=seq_len, training=is_training
+            )
+
+        # Run multiple inference iterations to ensure consistency
+        for i in range(3):
+            out = random_model(input_ids, input_pos)
+            self.assertIsNotNone(out, f"Model failed to run on iteration {i}")
+
+
+common_utils.instantiate_parametrized_tests(TorchAOBasicTestCase)
+
+if __name__ == "__main__":
+    unittest.main()