1 files changed, 53 insertions, 0 deletions
diff --git a/tensorflow/contrib/lite/toco/graph_transformations/resolve_gather_attributes.cc b/tensorflow/contrib/lite/toco/graph_transformations/resolve_gather_attributes.cc
new file mode 100644
index 0000000000..ce825c91af
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+++ b/tensorflow/contrib/lite/toco/graph_transformations/resolve_gather_attributes.cc
@@ -0,0 +1,53 @@
+/* Copyright 2018 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.
+==============================================================================*/
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "tensorflow/contrib/lite/toco/graph_transformations/graph_transformations.h"
+#include "tensorflow/contrib/lite/toco/model.h"
+#include "tensorflow/contrib/lite/toco/tooling_util.h"
+#include "tensorflow/core/platform/logging.h"
+
+namespace toco {
+
+bool ResolveGatherAttributes::Run(Model* model, std::size_t op_index) {
+  auto* gather_op = model->operators[op_index].get();
+  if (gather_op->type != OperatorType::kGather) return false;
+  auto* op = static_cast<GatherOperator*>(gather_op);
+
+  if (op->axis) {
+    // Attributes already resolved
+    return false;
+  }
+  if (op->inputs.size() != 3) return false;
+  if (!IsConstantParameterArray(*model, op->inputs[2])) return false;
+
+  const auto& indices_array = model->GetArray(op->inputs[2]);
+  if (!indices_array.has_shape()) return false;
+  const auto& axis_data = indices_array.GetBuffer<ArrayDataType::kInt32>().data;
+  CHECK_EQ(axis_data.size(), 1)
+      << "Multidimensional gather not supported on " << LogName(*op);
+  op->axis = {axis_data[0]};
+
+  // Drop the axis array as we no longer need it.
+  DeleteArrayIfUsedOnce(op->inputs[2], model);
+  op->inputs.resize(2);
+
+  return true;
+}
+
+}  // namespace toco