chore: import upstream snapshot with attribution

tensorflow/python/keras/protobuf/BUILD

@@ -0,0 +1,46 @@
+# Description:
+#   Contains Keras protobufs
+
+load("@rules_python//python:proto.bzl", "py_proto_library")
+load("//tensorflow/core/platform:build_config.bzl", "tf_proto_library")
+
+package(
+    # copybara:uncomment default_applicable_licenses = ["//tensorflow:license"],
+    default_visibility = [
+        "//tensorflow/python/keras:__subpackages__",
+    ],
+    licenses = ["notice"],
+)
+
+tf_proto_library(
+    name = "projector_config_proto",
+    srcs = ["projector_config.proto"],
+)
+
+tf_proto_library(
+    name = "saved_metadata_proto",
+    srcs = ["saved_metadata.proto"],
+    protodeps = [":versions_proto"],
+)
+
+tf_proto_library(
+    name = "versions_proto",
+    srcs = ["versions.proto"],
+)
+
+# copybara:uncomment_begin(google-only)
+# py_proto_library(
+#     name = "saved_metadata_proto_py_pb2",
+#     deps = [":saved_metadata_proto"],
+# )
+#
+# py_proto_library(
+#     name = "projector_config_proto_py_pb2",
+#     deps = [":projector_config_proto"],
+# )
+#
+# py_proto_library(
+#     name = "versions_proto_py_pb2",
+#     deps = [":versions_proto"],
+# )
+# copybara:uncomment_end

tensorflow/python/keras/protobuf/projector_config.proto

@@ -0,0 +1,50 @@
+/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+
+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.
+==============================================================================*/
+
+// This file is a copy of the TensorBoard ProjectorConfig proto.
+// Keep this file in sync with the source proto definition at
+// https://github.com/tensorflow/tensorboard/blob/master/tensorboard/plugins/projector/projector_config.proto
+
+syntax = "proto3";
+
+package third_party.tensorflow.python.keras.protobuf;
+
+message SpriteMetadata {
+  string image_path = 1;
+  // [width, height] of a single image in the sprite.
+  repeated uint32 single_image_dim = 2;
+}
+
+message EmbeddingInfo {
+  string tensor_name = 1;
+  string metadata_path = 2;
+  string bookmarks_path = 3;
+  // Shape of the 2D tensor [N x D]. If missing, it will be inferred from the
+  // model checkpoint.
+  repeated uint32 tensor_shape = 4;
+  SpriteMetadata sprite = 5;
+  // Path to the TSV file holding the tensor values. If missing, the tensor
+  // is assumed to be stored in the model checkpoint.
+  string tensor_path = 6;
+}
+
+message ProjectorConfig {
+  // Path to the checkpoint file. Use either this or model_checkpoint_dir.
+  string model_checkpoint_path = 1;
+  repeated EmbeddingInfo embeddings = 2;
+  // Path to the checkpoint directory. The directory will be scanned for the
+  // latest checkpoint file.
+  string model_checkpoint_dir = 3;
+}

tensorflow/python/keras/protobuf/saved_metadata.proto

@@ -0,0 +1,51 @@
+// Copyright 2026 The TensorFlow Authors. All Rights Reserved.
+//
+// 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.
+// ==============================================================================
+
+// Protobuf containing the metadata for each Keras object saved in a SavedModel.
+
+syntax = "proto3";
+
+package third_party.tensorflow.python.keras.protobuf;
+
+import "tensorflow/python/keras/protobuf/versions.proto";
+
+message SavedMetadata {
+  // Nodes represent trackable objects in the SavedModel. The data for every
+  // Keras object is stored.
+  repeated SavedObject nodes = 1;
+}
+
+// Metadata of an individual Keras object.
+message SavedObject {
+  reserved 1;  // For previous VersionDef info.
+
+  // Index of the node in the SavedModel SavedObjectGraph.
+  int32 node_id = 2;
+  // String path from root (e.g. "root.child_layer")
+  string node_path = 3;
+
+  // Identifier to determine loading function.
+  // Must be one of:
+  //   _tf_keras_input_layer, _tf_keras_layer, _tf_keras_metric,
+  //   _tf_keras_model, _tf_keras_network, _tf_keras_rnn_layer,
+  //   _tf_keras_sequential
+  string identifier = 4;
+  // Metadata containing a JSON-serialized object with the non-TensorFlow
+  // attributes for this Keras object.
+  string metadata = 5;
+
+  // Version defined by the code serializing this Keras object.
+  third_party.tensorflow.python.keras.protobuf.VersionDef version = 6;
+}

tensorflow/python/keras/protobuf/versions.proto

@@ -0,0 +1,48 @@
+// Copyright 2026 The TensorFlow Authors. All Rights Reserved.
+//
+// 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.
+// ==============================================================================
+
+syntax = "proto3";
+
+package third_party.tensorflow.python.keras.protobuf;
+
+// This file is a copy of the TensorFlow Versions proto.
+// Keep this file in sync with the source proto definition at
+// https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/framework/versions.proto
+
+// Version information for a piece of serialized data
+//
+// There are different types of versions for each type of data
+// (GraphDef, etc.), but they all have the same common shape
+// described here.
+//
+// Each consumer has "consumer" and "min_producer" versions (specified
+// elsewhere).  A consumer is allowed to consume this data if
+//
+//   producer >= min_producer
+//   consumer >= min_consumer
+//   consumer not in bad_consumers
+//
+// LINT.IfChange
+message VersionDef {
+  // The version of the code that produced this data.
+  int32 producer = 1;
+
+  // Any consumer below this version is not allowed to consume this data.
+  int32 min_consumer = 2;
+
+  // Specific consumer versions which are disallowed (e.g. due to bugs).
+  repeated int32 bad_consumers = 3;
+}
+// LINT.ThenChange(//tensorflow/core/framework/versions.proto)