Remove support for adjoints of nodes

doc/examples/mnist_mlp/dist_mnist_mlp.cpp

@@ -175,8 +175,8 @@ int main(int argc, char* argv[])
     auto delta = -learning_rate * loss;
 
     // Updates
-    ngraph::autodiff::Adjoints adjoints(NodeVector{loss},
-                                        NodeVector{delta});
+    ngraph::autodiff::Adjoints adjoints(OutputVector{loss},
+                                        OutputVector{delta});
     auto grad_W0 = adjoints.backprop_node(W0);
     auto grad_b0 = adjoints.backprop_node(b0);
     auto grad_W1 = adjoints.backprop_node(W1);

doc/examples/mnist_mlp/mnist_mlp.cpp

@@ -172,8 +172,8 @@ int main(int argc, const char* argv[])
     auto delta = -learning_rate * loss;
 
     // Updates
-    ngraph::autodiff::Adjoints adjoints(NodeVector{loss},
-                                        NodeVector{delta});
+    ngraph::autodiff::Adjoints adjoints(OutputVector{loss},
+                                        OutputVector{delta});
     auto W0_next = W0 + adjoints.backprop_node(W0);
     auto b0_next = b0 + adjoints.backprop_node(b0);
     auto W1_next = W1 + adjoints.backprop_node(W1);

doc/sphinx/source/core/constructing-graphs/execute.rst

@@ -99,8 +99,8 @@ Once the graph is built, we need to package it in a ``Function``:
    :lines: 35-36
 
 The first argument to the constuctor specifies the nodes that the function will 
-return; in this case, the product. A ``NodeVector`` is a vector of shared 
-pointers of ``op::Node``.  The second argument specifies the parameters of the 
+return; in this case, the product. An ``OutputVector`` is a vector of references to 
+outputs of ``op::Node``.  The second argument specifies the parameters of the 
 function, in the order they are to be passed to the compiled function. A 
 ``ParameterVector`` is a vector of shared pointers to ``op::Parameter``. 
 

src/ngraph/autodiff/adjoints.cpp

@@ -51,11 +51,6 @@ OutputVector make_zeros(std::shared_ptr<Node> x)
     return zeros;
 }
 
-autodiff::Adjoints::Adjoints(const NodeVector& ys, const NodeVector& cs)
-    : Adjoints(OutputVector(ys.begin(), ys.end()), OutputVector(cs.begin(), cs.end()))
-{
-}
-
 autodiff::Adjoints::Adjoints(const OutputVector& ys, const OutputVector& cs)
 {
     if (ys.size() != cs.size())

src/ngraph/autodiff/adjoints.hpp

@@ -46,8 +46,6 @@ namespace ngraph
             /// \param c An expression for where to evaluate the derivatives
             Adjoints(const OutputVector& y, const OutputVector& c);
 
-            Adjoints(const NodeVector& y, const NodeVector& c);
-
             Adjoints(const Adjoints& adjoints) = default;
             Adjoints& operator=(const Adjoints& adjoints) = default;
             Adjoints() = default;

src/ngraph/function.cpp

@@ -41,6 +41,30 @@ Function::Function(const ResultVector& results,
     init();
 }
 
+Function::Function(const OutputVector& results,
+                   const ParameterVector& parameters,
+                   const std::string& name)
+    : m_results(results.size())
+    , m_parameters(parameters)
+    , m_temporary_pool_size(0)
+    , m_instance_id(m_next_instance_id.fetch_add(1))
+    , m_name(name)
+    , m_unique_name("Function_" + to_string(m_instance_id))
+{
+    if (std::any_of(results.cbegin(), results.cend(), [](Output<Node> n) {
+            return std::dynamic_pointer_cast<op::Result>(n.get_node_shared_ptr());
+        }))
+    {
+        throw ngraph_error(
+            " Results already contain op::Results. Use a c-tor that takes a ResultVector");
+    }
+
+    std::transform(results.begin(), results.end(), m_results.begin(), [](Output<Node> n) {
+        return std::make_shared<op::Result>(n);
+    });
+    init();
+}
+
 Function::Function(const NodeVector& results,
                    const ParameterVector& parameters,
                    const std::string& name)
@@ -208,6 +232,11 @@ shared_ptr<Node> Function::get_output_op(size_t i) const
     return m_results.at(i);
 }
 
+Output<Node> Function::output(size_t i) const
+{
+    return m_results.at(i);
+}
+
 shared_ptr<Node> Function::get_result() const
 {
     if (m_results.size() != 1)

src/ngraph/function.hpp

@@ -37,6 +37,10 @@ namespace ngraph
                  const ParameterVector& parameters,
                  const std::string& name = "");
 
+        Function(const OutputVector& results,
+                 const ParameterVector& parameters,
+                 const std::string& name = "");
+
         Function(const std::shared_ptr<Node>& result,
                  const ParameterVector& parameters,
                  const std::string& name = "");
@@ -55,6 +59,8 @@ namespace ngraph
         /// Return the op that generates output i
         std::shared_ptr<Node> get_output_op(size_t i) const;
 
+        Output<Node> output(size_t i) const;
+
         /// Return the element type of output i
         const element::Type& get_output_element_type(size_t i) const;
 

test/backend/batch_norm.in.cpp

@@ -733,8 +733,8 @@ NGRAPH_TEST(${BACKEND_NAME}, batch_norm_bprop_n4c3h2w2)
     auto C = std::make_shared<op::Parameter>(element::f32, shape_r);
 
     auto zero = ngraph::make_zero(bn_dgamma->get_element_type(), bn_dgamma->get_shape());
-    ngraph::autodiff::Adjoints adjoints(NodeVector{bn_dx, bn_dgamma, bn_dbeta},
-                                        NodeVector{C, zero, zero});
+    ngraph::autodiff::Adjoints adjoints(OutputVector{bn_dx, bn_dgamma, bn_dbeta},
+                                        OutputVector{C, zero, zero});
 
     auto dinput = adjoints.backprop_node(input);
     auto dgamma = adjoints.backprop_node(gamma);

test/backend/binary_elementwise.in.cpp

@@ -257,10 +257,10 @@ NGRAPH_TEST(${BACKEND_NAME}, divide_adjoint_stability)
         auto B = make_shared<op::Parameter>(element::f32, shape);
         auto f = make_shared<Function>(make_shared<op::Divide>(A, B), ParameterVector{A, B});
 
-        auto Y_out = f->get_output_op(0);
+        auto Y_out = f->output(0);
         auto Xs = f->get_parameters();
-        auto C = std::make_shared<op::Parameter>(Y_out->get_element_type(), Y_out->get_shape());
-        ngraph::autodiff::Adjoints adjoints(NodeVector{Y_out}, NodeVector{C});
+        auto C = std::make_shared<op::Parameter>(Y_out.get_element_type(), Y_out.get_shape());
+        ngraph::autodiff::Adjoints adjoints(OutputVector{Y_out}, OutputVector{C});
         std::vector<std::shared_ptr<Node>> dYdXs(Xs.size());
         transform(
             Xs.begin(), Xs.end(), dYdXs.begin(), [C, &adjoints](const std::shared_ptr<Node>& X) {

test/cpu_fusion.cpp

@@ -507,7 +507,8 @@ TEST(cpu_fusion, conv_bias_bprop_n1c1h3w3)
     auto f = make_shared<Function>(
         convolution_bias, ParameterVector{conv_test.data, conv_test.weights, conv_test.bias});
 
-    ngraph::autodiff::Adjoints adjoints(NodeVector{convolution_bias}, NodeVector{conv_test.delta});
+    ngraph::autodiff::Adjoints adjoints(OutputVector{convolution_bias},
+                                        OutputVector{conv_test.delta});
 
     auto d_data = adjoints.backprop_node(conv_test.data);
     auto d_weights = adjoints.backprop_node(conv_test.weights);
@@ -546,7 +547,7 @@ TEST(cpu_fusion, conv_bias_bprop)
     pass_manager.register_pass<pass::VisualizeTree>("conv_bias_bprop_fusion.png");
     auto f = make_shared<Function>(conv_bias, ParameterVector{data_batch, filters, bias});
 
-    ngraph::autodiff::Adjoints adjoints(NodeVector{conv_bias}, NodeVector{delta});
+    ngraph::autodiff::Adjoints adjoints(OutputVector{conv_bias}, OutputVector{delta});
 
     auto d_data = adjoints.backprop_node(data_batch);
     auto d_weights = adjoints.backprop_node(filters);
@@ -1452,7 +1453,7 @@ TEST(cpu_fusion, max_pool_with_indices)
     auto max_pool = std::make_shared<op::MaxPool>(input, window_shape);
     auto C = std::make_shared<op::Parameter>(element::f32, max_pool->get_shape());
 
-    ngraph::autodiff::Adjoints adjoints(NodeVector{max_pool}, NodeVector{C});
+    ngraph::autodiff::Adjoints adjoints(ngraph::OutputVector{max_pool}, ngraph::OutputVector{C});
 
     auto dinput = adjoints.backprop_node(input);
 
@@ -1789,14 +1790,14 @@ static std::shared_ptr<ngraph::Function> make_forward_function()
     return std::make_shared<Function>(NodeVector{max_pool, neg, absn}, ParameterVector{input});
 }
 
-static std::pair<std::shared_ptr<ngraph::Function>, std::vector<std::shared_ptr<ngraph::Node>>>
+static std::pair<std::shared_ptr<ngraph::Function>, OutputVector>
     make_backward_function(std::shared_ptr<ngraph::Function> f)
 {
     // get parameters
     std::vector<std::shared_ptr<ngraph::op::Parameter>> back_parameters = f->get_parameters();
 
-    ngraph::NodeVector adjoints;
-    ngraph::NodeVector outputs;
+    ngraph::OutputVector adjoints;
+    ngraph::OutputVector outputs;
     for (auto Y : f->get_results())
     {
         // Get the output
@@ -1809,7 +1810,7 @@ static std::pair<std::shared_ptr<ngraph::Function>, std::vector<std::shared_ptr<
     ngraph::autodiff::Adjoints adjoint{outputs, adjoints};
 
     // Perform autodiff
-    std::vector<std::shared_ptr<Node>> dYdXs(back_parameters.size());
+    OutputVector dYdXs(back_parameters.size());
     transform(back_parameters.begin(),
               back_parameters.end(),
               dYdXs.begin(),
@@ -1818,7 +1819,8 @@ static std::pair<std::shared_ptr<ngraph::Function>, std::vector<std::shared_ptr<
     // create the backward function
     std::vector<std::shared_ptr<ngraph::op::Parameter>> param_adjoints;
     for (auto n : adjoints)
-        param_adjoints.push_back(std::dynamic_pointer_cast<ngraph::op::Parameter>(n));
+        param_adjoints.push_back(
+            std::dynamic_pointer_cast<ngraph::op::Parameter>(n.get_node_shared_ptr()));
     back_parameters.insert(back_parameters.begin(), param_adjoints.begin(), param_adjoints.end());
 
     return {std::make_shared<ngraph::Function>(dYdXs, back_parameters), adjoints};
@@ -2703,7 +2705,7 @@ void sigmoid_multiply_fusion_backward_compute(runtime::Backend* backend,
     auto sigmoid_mul =
         make_shared<op::SigmoidMultiply>(input_0_alt, input_1_alt, input_0_type, input_1_type);
 
-    ngraph::autodiff::Adjoints adjoints(NodeVector{sigmoid_mul}, NodeVector{delta_param});
+    ngraph::autodiff::Adjoints adjoints(OutputVector{sigmoid_mul}, OutputVector{delta_param});
     auto d_input_0 = adjoints.backprop_node(input_0_adjoint);
     auto d_input_1 = adjoints.backprop_node(input_1_adjoint);
     auto df = make_shared<Function>(NodeVector{d_input_0, d_input_1}, back_params);

test/util/autodiff/backprop_derivative.hpp

@@ -144,7 +144,7 @@ namespace ngraph
             // df/dX*
             std::vector<std::shared_ptr<Node>> df_output_params;
 
-            Adjoints adjoints(NodeVector{f->get_output_op(0)}, NodeVector{c_param});
+            Adjoints adjoints(OutputVector{f->output(0)}, OutputVector{c_param});
 
             // for each x "of interest"
             for (auto x : indep_params)

test/util/autodiff/backprop_function.cpp

@@ -32,10 +32,10 @@ using namespace ngraph;
 
 std::shared_ptr<Function> autodiff::backprop_function(const std::shared_ptr<Function>& f)
 {
-    auto Y_out = f->get_output_op(0);
+    auto Y_out = f->output(0);
     auto Xs = f->get_parameters();
-    auto C = std::make_shared<op::Parameter>(Y_out->get_element_type(), Y_out->get_shape());
-    Adjoints adjoints(NodeVector{Y_out}, NodeVector{C});
+    auto C = std::make_shared<op::Parameter>(Y_out.get_element_type(), Y_out.get_shape());
+    Adjoints adjoints(OutputVector{Y_out}, OutputVector{C});
     std::vector<std::shared_ptr<Node>> dYdXs(Xs.size());
     transform(Xs.begin(), Xs.end(), dYdXs.begin(), [C, &adjoints](const std::shared_ptr<Node>& X) {
         return adjoints.backprop_node(X);