Add an async_node_hash_map for asynchronous hash map update.

PiperOrigin-RevId: 368262096

Author: Neural-Link Team

WORKSPACE

@@ -2,6 +2,10 @@ workspace(name = "org_tensorflow_neural_structured_learning")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
+# farmhash
+load("//research/carls/third_party/farmhash:workspace.bzl", farmhash = "repo")
+farmhash()
+
 # absl
 http_archive(
     name = "com_google_absl",

research/carls/base/BUILD

@@ -160,3 +160,28 @@ cc_test(
         "@tensorflow_solib//:framework_lib",
     ],
 )
+
+cc_library(
+    name = "async_node_hash_map",
+    hdrs = ["async_node_hash_map.h"],
+    deps = [
+        "@com_google_absl//absl/container:flat_hash_map",
+        "@com_google_absl//absl/container:node_hash_map",
+        "@com_google_absl//absl/container:raw_hash_set",
+        "@com_google_absl//absl/synchronization",
+        "@tensorflow_includes//:includes",
+        "@tensorflow_solib//:framework_lib",
+    ],
+)
+
+cc_test(
+    name = "async_node_hash_map_test",
+    srcs = ["async_node_hash_map_test.cc"],
+    deps = [
+        ":async_node_hash_map",
+        "@com_google_absl//absl/strings",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+        "@farmhash_archive//:farmhash",
+    ],
+)