feat: Handle empty schemas for unsupported ops

Signed-off-by: Dheeraj Peri <[email protected]>

Author: peri044

core/conversion/conversion.cpp

@@ -6,7 +6,7 @@
 #include "core/conversion/evaluators/evaluators.h"
 #include "core/conversion/var/Var.h"
 #include "core/util/prelude.h"
-
+#include <ATen/core/operator_name.h>
 #include "c10/util/intrusive_ptr.h"
 #include "core/conversion/converters/converter_util.h"
 #include "core/conversion/tensorcontainer/TensorContainer.h"
@@ -491,11 +491,20 @@ std::unordered_map<c10::OperatorName, std::string> GetUnsupportedOpsInBlock(cons
     auto schema = n->maybeSchema();
     // Some ops like torch::jit::prim::Loop, torch::jit::prim::If, torch::jit::prim::DictConstruct don't have a schema but they are supported.
     // torch::jit::prim::DictConstruct is supported via fallback only
-    if (schema && !OpSupported(n)) {
-      std::stringstream ss;
-      ss << *schema;
-      unsupported_ops[schema->operator_name()] = ss.str();
+    if (!OpSupported(n)) {
+      if (schema){
+        std::stringstream ss;
+        ss << *schema;
+        unsupported_ops[schema->operator_name()] = ss.str();
+      } else {
+        std::stringstream ss;
+        ss << util::node_info(n);
+        // operator.overload is a filler name just to call the constructor.
+        c10::OperatorName op(ss.str(), "operator.overload");
+        unsupported_ops[op] = ss.str();
+      }
     }
+
     for (const auto sub_b : n->blocks()) {
       auto sub_b_unsupported_ops = GetUnsupportedOpsInBlock(sub_b);
       unsupported_ops.insert(sub_b_unsupported_ops.begin(), sub_b_unsupported_ops.end());
@@ -530,7 +539,7 @@ std::set<std::string> ConvertableOpsInBlock(const torch::jit::Block* b) {
 
 bool VerifyConverterSupportForBlock(const torch::jit::Block* b, bool suppress_errors) {
   auto unsupported_ops = GetUnsupportedOpsInBlock(b);
-
+  LOG_DEBUG("======unsupported_ops size ===========: " << unsupported_ops.size());
   if (unsupported_ops.size() != 0) {
     std::stringstream unsupported_msg;
     unsupported_msg