[TVMC] use target_host when it is set (apache#6855)

* [TVMC] add cl support in tvmc runner

* [TVMC] use target_host when it is set

* Cleanup comment and asssert device type in else case

* add a test for tvmc compiler

* remove unused func

python/tvm/driver/tvmc/compiler.py

@@ -178,18 +178,18 @@ def compile_model(
         mod = common.convert_graph_layout(mod, alter_layout)
 
     tvm_target = common.target_from_cli(target)
-    target_host = target_host or ""
+    target_host = tvm_target if not target_host else target_host
 
     if tuning_records and os.path.exists(tuning_records):
         logger.debug("tuning records file provided: %s", tuning_records)
         with autotvm.apply_history_best(tuning_records):
             with tvm.transform.PassContext(opt_level=3):
                 logger.debug("building relay graph with tuning records")
-                graph_module = relay.build(mod, tvm_target, params=params, target_host=tvm_target)
+                graph_module = relay.build(mod, tvm_target, params=params, target_host=target_host)
     else:
         with tvm.transform.PassContext(opt_level=3):
             logger.debug("building relay graph (no tuning records provided)")
-            graph_module = relay.build(mod, tvm_target, params=params, target_host=tvm_target)
+            graph_module = relay.build(mod, tvm_target, params=params, target_host=target_host)
 
     # Generate output dump files with sources
     dump_code = dump_code or []

tests/python/driver/tvmc/conftest.py

@@ -148,3 +148,16 @@ def imagenet_cat(tmpdir_factory):
     np.savez(cat_file_full_path, input=image_data)
 
     return cat_file_full_path
+
+
+@pytest.fixture(scope="session")
+def tflite_mobilenet_v1_0_25_128(tmpdir_factory):
+    base_url = "https://storage.googleapis.com/download.tensorflow.org/models"
+    model_url = "mobilenet_v1_2018_02_22/mobilenet_v1_0.25_128.tgz"
+    model_file = download_and_untar(
+        "{}/{}".format(base_url, model_url),
+        "mobilenet_v1_0.25_128.tflite",
+        temp_dir=tmpdir_factory.mktemp("data"),
+    )
+
+    return model_file

tests/python/driver/tvmc/test_compiler.py

@@ -150,3 +150,21 @@ def test_cross_compile_aarch64_onnx_module(onnx_resnet50):
     assert type(params) is dict
     assert type(dumps) is dict
     assert "asm" in dumps.keys()
+
+
+@tvm.testing.requires_opencl
+def test_compile_opencl(tflite_mobilenet_v1_0_25_128):
+    pytest.importorskip("tflite")
+
+    graph, lib, params, dumps = tvmc.compiler.compile_model(
+        tflite_mobilenet_v1_0_25_128,
+        target="opencl",
+        target_host="llvm",
+        alter_layout="NCHW",
+    )
+
+    # check for output types
+    assert type(graph) is str
+    assert type(lib) is tvm.runtime.module.Module
+    assert type(params) is dict
+    assert type(dumps) is dict