[1/3] Reverb: Rename distributions package to item_selectors.

This rename reflects the fact that not all of the "distributions" were stochastic.

PiperOrigin-RevId: 312486733
Change-Id: Iaac336a8eee1ea9bbbf3ad7ee7a88290ebc46471

reverb/BUILD

@@ -25,6 +25,7 @@ reverb_pytype_strict_library(
         ":distributions",
         ":ensure_tf_install",
         ":errors",
+        ":item_selectors",
         ":rate_limiters",
         ":replay_sample",
         ":server",
@@ -36,7 +37,7 @@ reverb_pytype_strict_library(
     name = "distributions",
     srcs = ["distributions.py"],
     srcs_version = "PY3",
-    deps = [":pybind"],
+    deps = [":item_selectors"],
 )
 
 reverb_pytype_strict_library(
@@ -147,6 +148,20 @@ reverb_pytype_library(
     ],
 )
 
+reverb_pytype_strict_library(
+    name = "ensure_tf_install",
+    srcs = ["platform/default/ensure_tf_install.py"],
+    srcs_version = "PY3",
+)
+
+reverb_pytype_strict_library(
+    name = "item_selectors",
+    srcs = ["item_selectors.py"],
+    srcs_version = "PY3",
+    visibility = ["//visibility:private"],
+    deps = [":pybind"],
+)
+
 reverb_py_test(
     name = "checkpointer_test",
     srcs = ["checkpointer_test.py"],
@@ -215,9 +230,3 @@ reverb_py_test(
         ":reverb",
     ],
 )
-
-reverb_pytype_strict_library(
-    name = "ensure_tf_install",
-    srcs = ["platform/default/ensure_tf_install.py"],
-    srcs_version = "PY3",
-)

reverb/__init__.py

@@ -25,6 +25,7 @@
 # pylint: enable=g-bad-import-order
 
 from reverb import distributions
+from reverb import item_selectors as selectors
 from reverb import rate_limiters
 
 from reverb.client import Client

reverb/distributions.py

@@ -14,13 +14,11 @@
 
 """Sampling and removing distributions."""
 
-import functools
+from reverb import item_selectors
 
-from reverb import pybind
-
-Fifo = pybind.FifoDistribution
-Lifo = pybind.LifoDistribution
-MaxHeap = functools.partial(pybind.HeapDistribution, False)  # pylint: disable=invalid-name
-MinHeap = functools.partial(pybind.HeapDistribution, True)  # pylint: disable=invalid-name
-Prioritized = pybind.PrioritizedDistribution
-Uniform = pybind.UniformDistribution
+Fifo = item_selectors.Fifo
+Lifo = item_selectors.Lifo
+MaxHeap = item_selectors.MaxHeap
+MinHeap = item_selectors.MinHeap
+Prioritized = item_selectors.Prioritized
+Uniform = item_selectors.Uniform

reverb/item_selectors.py

@@ -0,0 +1,26 @@
+# Copyright 2019 DeepMind Technologies Limited.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Sampling and removing distributions."""
+
+import functools
+
+from reverb import pybind
+
+Fifo = pybind.FifoDistribution
+Lifo = pybind.LifoDistribution
+MaxHeap = functools.partial(pybind.HeapDistribution, False)  # pylint: disable=invalid-name
+MinHeap = functools.partial(pybind.HeapDistribution, True)  # pylint: disable=invalid-name
+Prioritized = pybind.PrioritizedDistribution
+Uniform = pybind.UniformDistribution