Creates PackedTensors class to share code between TFCI and BLS2017 model.

Also updates command line argument parsing and model creation in BLS2017 model.

PiperOrigin-RevId: 259811485
Change-Id: I0e51a9b08d24697b12a28b66073e4068e74f024a

Author: Johannes Ball?

BUILD

@@ -12,6 +12,7 @@ py_library(
     deps = [
         "//tensorflow_compression/python/layers",
         "//tensorflow_compression/python/ops",
+        "//tensorflow_compression/python/util",
     ],
 )
 
@@ -34,6 +35,7 @@ py_binary(
         # The following targets are for Python test files.
         "//tensorflow_compression/python/layers:py_src",
         "//tensorflow_compression/python/ops:py_src",
+        "//tensorflow_compression/python/util:py_src",
     ],
 )
 
@@ -43,6 +45,12 @@ py_binary(
     deps = [":tensorflow_compression"],
 )
 
+py_binary(
+    name = "bls2017",
+    srcs = ["examples/bls2017.py"],
+    deps = [":tensorflow_compression"],
+)
+
 py_binary(
     name = "generate_docs",
     srcs = ["tools/generate_docs.py"],