Add Pyprof removal warnings that point to new repo (#862)

Co-authored-by: Michael Carilli <mcarilli@nvidia.com>

README.md

@@ -138,10 +138,8 @@ A Python-only build omits:
 - Fused kernels that improve the performance of `apex.parallel.DistributedDataParallel` and `apex.amp`.
 `DistributedDataParallel`, `amp`, and `SyncBatchNorm` will still be usable, but they may be slower.
 
-To enable PyProf support, you need to install the packages required by PyProf. To do so, add the "--pyprof" option at installation time:
-```
-$ pip install -v --no-cache-dir --global-option="--pyprof" --global-option="--cpp_ext" --global-option="--cuda_ext" ./
-```
+Pyprof support has been moved to its own [dedicated repository](https://github.com/NVIDIA/PyProf).
+The codebase is deprecated in Apex and will be removed soon.
 
 ### Windows support
 Windows support is experimental, and Linux is recommended.  `pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" .` may work if you were able to build Pytorch from source

apex/pyprof/nvtx/nvmarker.py

@@ -204,6 +204,13 @@ def patchClass(cls):
 			add_wrapper(cls, f)
 
 def init():
+	string = "\n\nPyprof has been moved to its own dedicated repository and will " + \
+			"soon be removed from Apex.  Please visit\n" + \
+			"https://github.com/NVIDIA/PyProf\n" + \
+			"for the latest version.\n\n"
+	# print regardless of warning state
+	print(string)
+
 	print("Initializing NVTX monkey patches")
 	for cls in [torch, torch.Tensor, torch.nn.functional,]:
 		patchClass(cls)

setup.py

@@ -22,7 +22,7 @@ if not torch.cuda.is_available():
     if os.environ.get("TORCH_CUDA_ARCH_LIST", None) is None:
         os.environ["TORCH_CUDA_ARCH_LIST"] = "6.0;6.1;6.2;7.0;7.5"
 
-print("torch.__version__  = ", torch.__version__)
+print("\n\ntorch.__version__  = {}\n\n".format(torch.__version__))
 TORCH_MAJOR = int(torch.__version__.split('.')[0])
 TORCH_MINOR = int(torch.__version__.split('.')[1])
 
@@ -35,6 +35,11 @@ ext_modules = []
 
 extras = {}
 if "--pyprof" in sys.argv:
+    string = "\n\nPyprof has been moved to its own dedicated repository and will " + \
+             "soon be removed from Apex.  Please visit\n" + \
+             "https://github.com/NVIDIA/PyProf\n" + \
+             "for the latest version."
+    warnings.warn(string, DeprecationWarning)
     with open('requirements.txt') as f:
         required_packages = f.read().splitlines()
         extras['pyprof'] = required_packages