fix(//py): Fix trtorch.Device alternate contructor options

There were issues setting fields of trtorch.Device via
kwargs, this patch should resolve those and verify that they
work

Signed-off-by: Naren Dasan <naren@narendasan.com>
Signed-off-by: Naren Dasan <narens@nvidia.com>

Author: narendasan

py/trtorch/Device.py

@@ -1,7 +1,7 @@
 import torch
 
 from trtorch import _types
-import logging
+import trtorch.logging
 import trtorch._C
 
 import warnings
@@ -54,23 +54,27 @@ def __init__(self, *args, **kwargs):
                 else:
                     self.dla_core = id
                     self.gpu_id = 0
-                    logging.log(logging.log.Level.Warning,
-                                "Setting GPU id to 0 for device because device 0 manages DLA on Xavier")
+                    trtorch.logging.log(trtorch.logging.Level.Warning,
+                                        "Setting GPU id to 0 for device because device 0 manages DLA on Xavier")
 
         elif len(args) == 0:
-            if not "gpu_id" in kwargs or not "dla_core" in kwargs:
+            if "gpu_id" in kwargs or "dla_core" in kwargs:
                 if "dla_core" in kwargs:
                     self.device_type = _types.DeviceType.DLA
                     self.dla_core = kwargs["dla_core"]
                     if "gpu_id" in kwargs:
                         self.gpu_id = kwargs["gpu_id"]
                     else:
                         self.gpu_id = 0
-                        logging.log(logging.log.Level.Warning,
-                                    "Setting GPU id to 0 for device because device 0 manages DLA on Xavier")
+                        trtorch.logging.log(trtorch.logging.Level.Warning,
+                                            "Setting GPU id to 0 for device because device 0 manages DLA on Xavier")
                 else:
                     self.gpu_id = kwargs["gpu_id"]
-                    self.device_type == _types.DeviceType.GPU
+                    self.device_type = _types.DeviceType.GPU
+            else:
+                raise ValueError(
+                    "Either gpu_id or dla_core or both must be defined if no string with device specs is provided as an arg"
+                )
 
         else:
             raise ValueError(
@@ -80,6 +84,7 @@ def __init__(self, *args, **kwargs):
         if "allow_gpu_fallback" in kwargs:
             if not isinstance(kwargs["allow_gpu_fallback"], bool):
                 raise TypeError("allow_gpu_fallback must be a bool")
+            self.allow_gpu_fallback = kwargs["allow_gpu_fallback"]
 
     def __str__(self) -> str:
         return "Device(type={}, gpu_id={}".format(self.device_type, self.gpu_id) \

tests/py/test_api.py

@@ -219,6 +219,53 @@ def test_is_colored_output_on(self):
         self.assertTrue(color)
 
 
+class TestDevice(unittest.TestCase):
+
+    def test_from_string_constructor(self):
+        device = trtorch.Device("cuda:0")
+        self.assertEqual(device.device_type, trtorch.DeviceType.GPU)
+        self.assertEqual(device.gpu_id, 0)
+
+        device = trtorch.Device("gpu:1")
+        self.assertEqual(device.device_type, trtorch.DeviceType.GPU)
+        self.assertEqual(device.gpu_id, 1)
+
+    def test_from_string_constructor_dla(self):
+        device = trtorch.Device("dla:0")
+        self.assertEqual(device.device_type, trtorch.DeviceType.DLA)
+        self.assertEqual(device.gpu_id, 0)
+        self.assertEqual(device.dla_core, 0)
+
+        device = trtorch.Device("dla:1", allow_gpu_fallback=True)
+        self.assertEqual(device.device_type, trtorch.DeviceType.DLA)
+        self.assertEqual(device.gpu_id, 0)
+        self.assertEqual(device.dla_core, 1)
+        self.assertEqual(device.allow_gpu_fallback, True)
+
+    def test_kwargs_gpu(self):
+        device = trtorch.Device(gpu_id=0)
+        self.assertEqual(device.device_type, trtorch.DeviceType.GPU)
+        self.assertEqual(device.gpu_id, 0)
+
+    def test_kwargs_dla_and_settings(self):
+        device = trtorch.Device(dla_core=1, allow_gpu_fallback=False)
+        self.assertEqual(device.device_type, trtorch.DeviceType.DLA)
+        self.assertEqual(device.gpu_id, 0)
+        self.assertEqual(device.dla_core, 1)
+        self.assertEqual(device.allow_gpu_fallback, False)
+
+        device = trtorch.Device(gpu_id=1, dla_core=0, allow_gpu_fallback=True)
+        self.assertEqual(device.device_type, trtorch.DeviceType.DLA)
+        self.assertEqual(device.gpu_id, 1)
+        self.assertEqual(device.dla_core, 0)
+        self.assertEqual(device.allow_gpu_fallback, True)
+
+    def test_from_torch(self):
+        device = trtorch.Device._from_torch_device(torch.device("cuda:0"))
+        self.assertEqual(device.device_type, trtorch.DeviceType.GPU)
+        self.assertEqual(device.gpu_id, 0)
+
+
 def test_suite():
     suite = unittest.TestSuite()
     suite.addTest(unittest.makeSuite(TestLoggingAPIs))
@@ -231,6 +278,7 @@ def test_suite():
     suite.addTest(
         TestModuleFallbackToTorch.parametrize(TestModuleFallbackToTorch, model=models.resnet18(pretrained=True)))
     suite.addTest(unittest.makeSuite(TestCheckMethodOpSupport))
+    suite.addTest(unittest.makeSuite(TestDevice))
 
     return suite