python.pkgs.tensorflow-probability: 0.7 -> 0.8.0

This unbreaks the build by updating to a newer version, adding new
dependencies and backporting some patches.

0.9 is released already, but that version is no longer compatible with
tf1. 0.8.0 is compatible with tf1 and tf2.

pkgs/development/python-modules/tensorflow-probability/default.nix

@@ -1,15 +1,18 @@
 { lib
 , fetchFromGitHub
+, fetchpatch
 , buildBazelPackage
 , buildPythonPackage
 , python
 , setuptools
 , wheel
+, absl-py
 , tensorflow
 , six
 , numpy
 , decorator
 , cloudpickle
+, gast
 , hypothesis
 , scipy
 , matplotlib
@@ -18,7 +21,7 @@
 }:
 
 let
-  version = "0.7";
+  version = "0.8.0";
   pname = "tensorflow_probability";
 
   # first build all binaries and generate setup.py using bazel
@@ -28,21 +31,37 @@ let
     src = fetchFromGitHub {
       owner = "tensorflow";
       repo = "probability";
-      rev = "v${version}";
-      sha256 = "0sy9gmjcvmwciamqvd7kd9qw2wd7ksklk80815fsn7sj0wiqxjyd";
+      rev = "${version}";
+      sha256 = "07cm8zba8n0ihzdm3k4a4rsg5v62xxsfvcw4h0niz91c0parqjqy";
     };
 
+    patches = [
+      (fetchpatch {
+        name = "gast-0.3.patch";
+        url = "https://github.com/tensorflow/probability/commit/ae7a9d9771771ec1e7755a3588b9325f050a84cc.patch";
+        sha256 = "0kfhx30gshm8f3945na9yjjik71r20qmjzifbigaj4l8dwd9dz1a";
+        excludes = ["testing/*"];
+      })
+      (fetchpatch {
+        name = "cloudpickle-1.2.patch";
+        url = "https://github.com/tensorflow/probability/commit/78ef12b5afe3f567d16c70b74015ed1ddff1b0c8.patch";
+        sha256 = "12ms2xcljvvrnig0j78s3wfv4yf3bm5ps4rgfgv5lg2a8mzpc1ga";
+      })
+    ];
+
     nativeBuildInputs = [
       # needed to create the output wheel in installPhase
       python
       setuptools
       wheel
+      absl-py
+      tensorflow
     ];
 
     bazelTarget = ":pip_pkg";
 
     fetchAttrs = {
-      sha256 = "0sjjj9z1dhilhpc8pq4154czrb79z9cm044jvn75kxcjv6v5l2m5";
+      sha256 = "0135nxxvkmjzpd80r1g9fdkk9h62g0xlvp32g5zgk0hkma5kq0bx";
     };
 
     buildAttrs = {
@@ -75,6 +94,7 @@ in buildPythonPackage {
     numpy
     decorator
     cloudpickle
+    gast
   ];
 
   # Listed here: