Type prop tests for Quantize/Dequantize (#1807)

* Add type_prop unit tests for Quantize

* Fix naming consistency; add test for unsupported RoundMode fail

* Add type-prop unit tests for Dequantize

src/ngraph/op/dequantize.cpp

@@ -50,9 +50,9 @@ void op::Dequantize::validate_and_infer_types()
     NODE_VALIDATION_ASSERT(this, m_type.is_real()) << "Output element type (" << m_type
                                                    << ") must be a floating point number";
 
-    NODE_VALIDATION_ASSERT(this, get_input_element_type(SCALE).is_real())
+    NODE_VALIDATION_ASSERT(this, get_input_element_type(SCALE) == m_type)
         << "Scale element type (" << get_input_element_type(SCALE)
-        << ") must be a floating point number";
+        << ") must match the output element type (" << m_type << ")";
 
     NODE_VALIDATION_ASSERT(this, get_input_element_type(OFFSET) == get_input_element_type(INPUT))
         << "Offset element type (" << get_input_element_type(OFFSET)
@@ -61,7 +61,7 @@ void op::Dequantize::validate_and_infer_types()
     for (auto axis : m_axes)
     {
         NODE_VALIDATION_ASSERT(this, axis < get_shape().size())
-            << "Quantizaztion axis (" << axis << ") is greater than input shape rank ("
+            << "Quantization axis (" << axis << ") must be less than input shape rank ("
             << get_shape().size() << ")";
     }
 

src/ngraph/op/quantize.cpp

@@ -53,9 +53,9 @@ void op::Quantize::validate_and_infer_types()
         << "Input element type (" << get_input_element_type(INPUT)
         << ") must be a floating point number";
 
-    NODE_VALIDATION_ASSERT(this, get_input_element_type(SCALE).is_real())
+    NODE_VALIDATION_ASSERT(this, get_input_element_type(SCALE) == get_input_element_type(INPUT))
         << "Scale element type (" << get_input_element_type(SCALE)
-        << ") must be a floating point number";
+        << ") must match input element type (" << get_input_element_type(INPUT) << ")";
 
     NODE_VALIDATION_ASSERT(this, get_input_element_type(OFFSET) == m_type)
         << "Offset element type (" << get_input_element_type(OFFSET)
@@ -64,7 +64,7 @@ void op::Quantize::validate_and_infer_types()
     for (auto axis : m_axes)
     {
         NODE_VALIDATION_ASSERT(this, axis < get_shape().size())
-            << "Quantizaztion axis (" << axis << ") is greater than input shape rank ("
+            << "Quantization axis (" << axis << ") must be less than input shape rank ("
             << get_shape().size() << ")";
     }