Add checks for conv + bias bprop fusion (#1063)

src/ngraph/runtime/cpu/pass/cpu_fusion.cpp

@@ -775,6 +775,10 @@ void ngraph::runtime::cpu::pass::CPUFusion::construct_conv_bias_bprop()
         auto conv_bprop =
             std::dynamic_pointer_cast<op::ConvolutionBackpropFilters>(m.get_match_root());
 
+        if (conv_bprop->get_input_shape(0).size() == 4 &&
+            conv_bprop->get_input_shape(1).size() == 4 &&
+            conv_bprop->get_input_element_type(0) == element::f32)
+        {
             for (auto delta_user : pattern_map[delta]->get_users())
             {
                 if (std::dynamic_pointer_cast<op::Sum>(delta_user))
@@ -801,6 +805,7 @@ void ngraph::runtime::cpu::pass::CPUFusion::construct_conv_bias_bprop()
                     return true;
                 }
             }
+        }
         return false;
     };