Revert "Upgrade to TensorFlow 2.5.0. (tensorflow#567)"

This reverts commit 61822e6.

.bazelversion

@@ -1 +1 @@
-3.7.2
+3.1.0

WORKSPACE

@@ -4,6 +4,16 @@
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
+http_archive(
+    name = "com_google_absl",
+    sha256 = "f368a8476f4e2e0eccf8a7318b98dafbe30b2600f4e3cf52636e5eb145aba06a",
+    strip_prefix = "abseil-cpp-df3ea785d8c30a9503321a3d35ee7d35808f190d",
+    urls = [
+        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/abseil/abseil-cpp/archive/df3ea785d8c30a9503321a3d35ee7d35808f190d.tar.gz",
+        "https://github.com/abseil/abseil-cpp/archive/df3ea785d8c30a9503321a3d35ee7d35808f190d.tar.gz",
+    ],
+)
+
 http_archive(
     name = "com_google_googletest",
     sha256 = "ff7a82736e158c077e76188232eac77913a15dac0b22508c390ab3f88e6d6d86",
@@ -43,11 +53,9 @@ protobuf_deps()
 # com_google_protobuf depends on @bazel_skylib ??
 http_archive(
     name = "bazel_skylib",
-    sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
-    urls = [
-        "https://storage.googleapis.com/mirror.tensorflow.org/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
-        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
-    ],
+    sha256 = "bbccf674aa441c266df9894182d80de104cabd19be98be002f6d478aaa31574d",
+    strip_prefix = "bazel-skylib-2169ae1c374aab4a09aa90e65efe1a3aad4e279b",
+    urls = ["https://github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz"],
 )
 
 http_archive(
@@ -77,28 +85,16 @@ http_archive(
 
 http_archive(
     name = "org_tensorflow",
-    sha256 = "e3d0ee227cc19bd0fa34a4539c8a540b40f937e561b4580d4bbb7f0e31c6a713",
-    strip_prefix = "tensorflow-2.5.0",
+    sha256 = "b91ec194ddf6c4a5a2f9d1db4af4daab0b187ff691e6f88142413d2c7e77a3bb",
+    strip_prefix = "tensorflow-2.4.1",
     urls = [
-        "https://github.com/tensorflow/tensorflow/archive/v2.5.0.zip",
+        "https://github.com/tensorflow/tensorflow/archive/v2.4.1.zip",
     ],
 )
 
-load("@org_tensorflow//tensorflow:workspace3.bzl", "workspace")
-
-workspace()
-
-load("@org_tensorflow//tensorflow:workspace2.bzl", "workspace")
-
-workspace()
-
-load("@org_tensorflow//tensorflow:workspace1.bzl", "workspace")
-
-workspace()
-
-load("@org_tensorflow//tensorflow:workspace0.bzl", "workspace")
+load("@org_tensorflow//tensorflow:workspace.bzl", "tf_workspace")
 
-workspace()
+tf_workspace(tf_repo_name = "@org_tensorflow")
 
 load("//third_party/tf:tf_configure.bzl", "tf_configure")
 

docs/install.md

@@ -84,7 +84,7 @@ As noted in the TensorFlow
 guide, the <a href="https://bazel.build/" class="external">Bazel</a>
 build system will be required.
 
-Our latest source builds use TensorFlow 2.5.0. To ensure compatibility we use `bazel` version 3.7.2. To remove any existing version of Bazel:
+Our latest source builds use TensorFlow 2.4.1. To ensure compatibility we use `bazel` version 3.1.0. To remove any existing version of Bazel:
 
 <!-- common_typos_disable -->
 <pre class="devsite-click-to-copy">
@@ -96,9 +96,9 @@ Download and install `bazel` version 3.1.0:
 
 <!-- common_typos_disable -->
 <pre class="devsite-click-to-copy">
-  <code class="devsite-terminal">wget https://github.com/bazelbuild/bazel/releases/download/3.7.2/bazel_3.7.2-linux-x86_64.deb
+  <code class="devsite-terminal">wget https://github.com/bazelbuild/bazel/releases/download/3.1.0/bazel_3.1.0-linux-x86_64.deb
 </code>
-  <code class="devsite-terminal">sudo dpkg -i bazel_3.7.2-linux-x86_64.deb</code>
+  <code class="devsite-terminal">sudo dpkg -i bazel_3.1.0-linux-x86_64.deb</code>
 </pre>
 <!-- common_typos_enable -->
 
@@ -122,7 +122,7 @@ Finally, confirm installation of the correct `bazel` version:
 ### 4. Build TensorFlow from source
 
 Here we adapt instructions from the TensorFlow [build from source](https://www.tensorflow.org/install/source)
-guide, see the link for further details. TensorFlow Quantum is compatible with TensorFlow version&nbsp;2.5.
+guide, see the link for further details. TensorFlow Quantum is compatible with TensorFlow version&nbsp;2.4.
 
 Download the
 <a href="https://github.com/tensorflow/tensorflow" class="external">TensorFlow source code</a>:
@@ -131,7 +131,7 @@ Download the
 <pre class="devsite-click-to-copy">
   <code class="devsite-terminal">git clone https://github.com/tensorflow/tensorflow.git</code>
   <code class="devsite-terminal">cd tensorflow</code>
-  <code class="devsite-terminal">git checkout v2.5.0</code>
+  <code class="devsite-terminal">git checkout v2.4.1</code>
 </pre>
 
 Be sure the virtual environment you created in step 2 is activated. Then, install the TensorFlow dependencies:

release/setup.py

@@ -58,7 +58,7 @@ def finalize_options(self):
 
 # placed as extra to not have required overwrite existing nightly installs if
 # they exist.
-EXTRA_PACKAGES = ['tensorflow == 2.5.0']
+EXTRA_PACKAGES = ['tensorflow == 2.4.1']
 CUR_VERSION = '0.5.0'
 
 
@@ -106,7 +106,6 @@ def has_ext_modules(self):
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
         'Topic :: Scientific/Engineering',
         'Topic :: Scientific/Engineering :: Artificial Intelligence',
         'Topic :: Scientific/Engineering :: Mathematics',

requirements.txt

@@ -1,15 +1,10 @@
 cirq==0.11.0
 sympy==1.5
-numpy==1.19.5  # TensorFlow can detect if it was built against other versions.
 nbconvert==5.6.1
 nbformat==4.4.0
 pylint==2.4.4
 yapf==0.28.0
-tensorflow==2.5.0
+tensorflow==2.4.1
+google-api-python-client==1.8.0
 # Needed for compatibility with cirq program protos.
 googleapis-common-protos==1.52.0
-google-api-core==1.21.0
-google-auth==1.18.0
-google-api-python-client==1.8.0
-grpcio==1.34.1
-protobuf==3.13.0