Update docs for tensorflow v1 issues (#60)

Author: markurtz

Makefile

@@ -7,7 +7,7 @@ DOCDIR := docs
 MDCHECKGLOBS := 'docs/**/*.md' 'docs/**/*.rst' 'examples/**/*.md' 'notebooks/**/*.md' 'scripts/**/*.md'
 MDCHECKFILES := CODE_OF_CONDUCT.md CONTRIBUTING.md DEVELOPING.md README.md
 
-TARGETS := ""  # targets for running pytests: keras,onnx,pytorch,pytorch_models,pytorch_datasets,tensorflow_v1,tensorflow_v1_models,tensorflow_v1_datasets
+TARGETS := ""  # targets for running pytests: keras,onnx,pytorch,pytorch_models,pytorch_datasets,tensorflow_v1,tensorflow_v1_datasets
 PYTEST_ARGS := ""
 ifneq ($(findstring keras,$(TARGETS)),keras)
     PYTEST_ARGS := $(PYTEST_ARGS) --ignore tests/sparseml/keras

README.md

@@ -331,6 +331,8 @@ pip install sparseml[tf_v1_gpu]
 
 Depending on your device and CUDA version, you may need to install additional dependencies for using TensorFlow V1 with GPU operations.  You can find these steps [here](https://www.tensorflow.org/install/gpu#older_versions_of_tensorflow).
 
+Note, TensorFlow V1 is no longer being built for newer operating systems such as Ubuntu 20.04. Therefore, SparseML with TensorFlow V1 is unsupported on these operating systems as well.
+
 ## Resources and Learning More
 
 - [SparseZoo Documentation](https://docs.neuralmagic.com/sparsezoo/)