chore: import upstream snapshot with attribution

tensorflow/go/util_test.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2016 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.
+*/
+
+package tensorflow
+
+func Placeholder(g *Graph, name string, dt DataType) (Output, error) {
+	op, err := g.AddOperation(OpSpec{
+		Type: "Placeholder",
+		Name: name,
+		Attrs: map[string]interface{}{
+			"dtype": dt,
+		},
+	})
+	return op.Output(0), err
+}
+
+func Const(g *Graph, name string, value interface{}) (Output, error) {
+	t, ok := value.(*Tensor)
+	if !ok {
+		var err error
+		if t, err = NewTensor(value); err != nil {
+			return Output{}, err
+		}
+	}
+	op, err := g.AddOperation(OpSpec{
+		Type: "Const",
+		Name: name,
+		Attrs: map[string]interface{}{
+			"dtype": t.DataType(),
+			"value": t,
+		},
+	})
+	return op.Output(0), err
+}
+
+func Neg(g *Graph, name string, port Output) (Output, error) {
+	op, err := g.AddOperation(OpSpec{
+		Type:  "Neg",
+		Name:  name,
+		Input: []Input{port},
+	})
+	return op.Output(0), err
+}
+
+func Add(g *Graph, name string, x, y Output) (Output, error) {
+	op, err := g.AddOperation(OpSpec{
+		Type:  "Add",
+		Name:  name,
+		Input: []Input{x, y},
+	})
+	return op.Output(0), err
+}