Fix/sanitize type comparisons, add test

src/ngraph/element_type.hpp

@@ -30,6 +30,7 @@ namespace ngraph
     {
         class Type
         {
+            Type(const Type&) = delete;
         public:
             Type(size_t bitwidth, bool is_float, bool is_signed, const std::string& cname);
 
@@ -75,6 +76,7 @@ namespace ngraph
         template <typename T>
         class TraitedType : public Type
         {
+            TraitedType(const TraitedType&) = delete;
         protected:
             TraitedType()
                 : Type(sizeof(T) * 8,

src/ngraph/node.cpp

@@ -30,6 +30,17 @@ ngraph::Node::Node(const std::vector<std::shared_ptr<Node>>& arguments,
     }
 }
 
+void ngraph::Node::set_value_type_checked(const std::shared_ptr<ValueType>& value_type)
+{
+    if (nullptr == m_value_type){
+        m_value_type = value_type;
+    } else {
+        if (*m_value_type != *value_type){
+            throw ngraph::ngraph_error("Setting value type to a different ValueType");
+        }
+    }
+}
+
 bool ngraph::Node::is_op() const
 {
     return dynamic_cast<const ngraph::Op*>(this) != nullptr;

src/ngraph/node.hpp

@@ -83,6 +83,12 @@ namespace ngraph
             m_value_type = value_type;
         }
 
+        // Set the value type if it has not already been set; otherwise, ensure that
+        // value_type agrees with the value type that was set. 
+        // This is used when the framework specifies a value type for the value, and we 
+        // independently compute what we thing the value type should be from the arguments.
+        void set_value_type_checked(const std::shared_ptr<ValueType>& value_type);
+
         bool is_op() const;
         bool is_parameter() const;
 

src/ngraph/ops/parameter.hpp

@@ -37,8 +37,8 @@ namespace ngraph
             void assign_function(Function* function, size_t index);
 
         public:
-            Parameter(const std::shared_ptr<ValueType>& value_type);
-            Parameter(const ngraph::element::Type element_type, const Shape& shape);
+            Parameter(const std::shared_ptr<ValueType>& value_type=nullptr);
+            Parameter(const ngraph::element::Type& element_type, const Shape& shape);
 
             std::string         description() const override { return "Parameter"; }
             virtual void        propagate_types() override;

src/ngraph/type.hpp

@@ -32,8 +32,8 @@ namespace ngraph
     {
     public:
         virtual ~ValueType() {}
-        virtual bool operator==(const std::shared_ptr<ValueType>& that) const = 0;
-        bool operator!=(const std::shared_ptr<ValueType>& that) const { return !(*this == that); }
+        virtual bool operator==(const ValueType& that) const = 0;
+        bool operator!=(const ValueType& that) const { return !(*this == that); }
     };
 
     /// Describes a tensor view; an element type and a shape.
@@ -51,7 +51,7 @@ namespace ngraph
         const element::Type& get_element_type() const { return m_element_type; }
         const Shape&         get_shape() const { return m_shape; }
 
-        virtual bool operator==(const std::shared_ptr<ValueType>& that) const override;
+        virtual bool operator==(const ValueType& that) const override;
 
     protected:
         const element::Type& m_element_type;
@@ -77,7 +77,7 @@ namespace ngraph
         }
         std::vector<std::shared_ptr<ValueType>> set_element_types() { return m_element_types; }
 
-        virtual bool operator==(const std::shared_ptr<ValueType>& that) const override;
+        virtual bool operator==(const ValueType& that) const override;
 
     protected:
         std::vector<std::shared_ptr<ValueType>> m_element_types;

src/ops/broadcast.cpp

@@ -38,7 +38,5 @@ void Broadcast::propagate_types()
     {
         throw ngraph_error("Broadcast arg, shape, and axes are incompatible");
     }
-    // TODO If m_type is already set (by framework), this should verify that the type
-    // we expect is consistent with the type the framework expects.
-    m_value_type = make_shared<TensorViewType>(arg_tensor_view_type->get_element_type(), m_shape);
+    set_value_type_checked(make_shared<TensorViewType>(arg_tensor_view_type->get_element_type(), m_shape));
 }

src/ops/dot.cpp

@@ -56,5 +56,5 @@ void Dot::propagate_types()
     copy(arg0_shape.begin(), arg0_shape.begin() + arg1_reduction, result_shape.end());
     copy(arg1_shape.begin(), arg1_shape.begin() + arg1_reduction, result_shape.end());
     copy(arg1_shape.begin() + arg1_reduction, arg1_shape.end(), result_shape.end());
-    m_value_type = make_shared<TensorViewType>(arg0_tensor_type->get_element_type(), result_shape);
+    set_value_type_checked(make_shared<TensorViewType>(arg0_tensor_type->get_element_type(), result_shape));
 }

src/ops/parameter.cpp

@@ -26,7 +26,7 @@ Parameter::Parameter(const std::shared_ptr<ValueType>& value_type)
 {
 }
 
-Parameter::Parameter(const ngraph::element::Type element_type, const Shape& shape)
+Parameter::Parameter(const ngraph::element::Type& element_type, const Shape& shape)
     : Parameter(make_shared<TensorViewType>(element_type, shape))
 {
 }

src/types/type.cpp

@@ -19,9 +19,9 @@
 using namespace std;
 using namespace ngraph;
 
-bool TensorViewType::operator==(const std::shared_ptr<ValueType>& that) const
+bool TensorViewType::operator==(const ValueType& that) const
 {
-    auto that_tvt = dynamic_pointer_cast<TensorViewType>(that);
+    auto that_tvt = dynamic_cast<const TensorViewType*>(&that);
     if (nullptr == that_tvt)
     {
         return false;
@@ -37,9 +37,9 @@ bool TensorViewType::operator==(const std::shared_ptr<ValueType>& that) const
     return true;
 }
 
-bool TupleType::operator==(const std::shared_ptr<ValueType>& that) const
+bool TupleType::operator==(const ValueType& that) const
 {
-    auto that_tvt = dynamic_pointer_cast<TupleType>(that);
+    auto that_tvt = dynamic_cast<const TupleType*>(&that);
     if (nullptr == that_tvt)
     {
         return false;

test/build_graph.cpp

@@ -81,7 +81,7 @@ TEST(build_graph, literal)
     auto float0            = make_shared<op::Float32ScalarConstant>(3.0);
     auto float_scalar_type = make_shared<TensorViewType>(element::Float32::element_type(), Shape{});
     ASSERT_EQ(float0->get_value(), 3.0);
-    ASSERT_EQ(*float0->get_value_type(), float_scalar_type);
+    ASSERT_EQ(*float0->get_value_type(), *float_scalar_type);
     auto d = make_shared<op::Dot>(float0, float0);
     ASSERT_EQ(d->get_arguments().at(0), float0);
     ASSERT_EQ(d->get_arguments().at(1), float0);
@@ -89,13 +89,51 @@ TEST(build_graph, literal)
     // float scalar from an int
     auto float1 = make_shared<op::Float32ScalarConstant>(3);
     ASSERT_EQ(float1->get_value(), 3);
-    ASSERT_EQ(*float1->get_value_type(), float_scalar_type);
+    ASSERT_EQ(*float1->get_value_type(), *float_scalar_type);
 
     auto int32_0           = make_shared<op::Int32ScalarConstant>(3.0);
     auto int32_scalar_type = make_shared<TensorViewType>(element::Int32::element_type(), Shape{});
     ASSERT_EQ(int32_0->get_value(), 3);
-    ASSERT_EQ(*int32_0->get_value_type(), int32_scalar_type);
-    ASSERT_NE(*int32_0->get_value_type(), float_scalar_type);
+    ASSERT_EQ(*int32_0->get_value_type(), *int32_scalar_type);
+    ASSERT_NE(*int32_0->get_value_type(), *float_scalar_type);
+}
+
+TEST(build_graph, set_value_type_checked)
+{
+    auto untyped_param = make_shared<op::Parameter>();
+    try {
+        untyped_param->set_value_type_checked(make_shared<TensorViewType>(element::Float32::element_type(), Shape{4, 4}));
+    } catch(...){
+        FAIL() << "Setting value type for first time type failed.";
+    }
+    try {
+        untyped_param->set_value_type_checked(make_shared<TensorViewType>(element::Float32::element_type(), Shape{4, 4}));
+    } catch(...){
+        FAIL() << "Setting value type to same type failed.";
+    }
+    try {
+        untyped_param->set_value_type_checked(make_shared<TensorViewType>(element::Float32::element_type(), Shape{4, 5}));
+        FAIL() << "Setting value type to a different shape did not fail.";
+    } catch(const ngraph_error& error){
+        EXPECT_EQ(error.what(), std::string("Setting value type to a different ValueType"));
+    } catch(...){
+        FAIL() << "Setting value type to a different shape did not failed with incorrect error.";
+    }
+    try {
+        untyped_param->set_value_type_checked(make_shared<TensorViewType>(element::Int32::element_type(), Shape{4, 4}));
+        FAIL() << "Setting value type to a different element type did not fail.";
+    } catch(const ngraph_error& error){
+        EXPECT_EQ(error.what(), std::string("Setting value type to a different ValueType"));
+    } catch(...){
+        FAIL() << "Setting value type to a different element type did not failed with incorrect error.";
+    }
+    
+    auto param = make_shared<op::Parameter>(element::Float32::element_type(), Shape{4, 4});
+    try {
+        param->set_value_type_checked(make_shared<TensorViewType>(element::Float32::element_type(), Shape{4, 4}));
+    } catch(...){
+        FAIL() << "Setting value type to same type failed.";
+    }
 }
 
 // Check argument inverses