feat!: Turning on partial compilation by default

BREAKING CHANGE: This commit turns on partial compilation
by default. Unsupported modules will attempt to be
run partially in PyTorch and partially in TensorRT

Signed-off-by: Naren Dasan <naren@narendasan.com>
Signed-off-by: Naren Dasan <narens@nvidia.com>

Author: narendasan

core/compiler.cpp

@@ -253,6 +253,7 @@ GraphAndMapping ConstructFallbackGraph(
       }
       // update the input ranges for each segments
       convert_cfg.inputs = ir::associate_specs_with_inputs(seg_block.g(), inputs, static_params);
+
       auto engine = conversion::ConvertBlockToEngine(seg_block.block(), convert_cfg, static_params);
       auto temp_g = std::make_shared<torch::jit::Graph>();
       auto device_spec = convert_cfg.engine_settings.device;
@@ -288,7 +289,7 @@ GraphAndMapping ConstructFallbackGraph(
 }
 
 
-void MapInputsAndDetermineDTypes(CompileSpec& cfg, std::shared_ptr<torch::jit::Graph>& g, ir::StaticParams& static_params, const util::InputTypeMap& first_use_type_map) {
+void MapInputsAndDetermineDTypes(CompileSpec& cfg, std::shared_ptr<torch::jit::Graph>& g, ir::StaticParams& static_params, ir::TypeMap& first_use_type_map) {
   // Associate input specs with inputs
   cfg.convert_info.inputs = std::move(ir::associate_specs_with_inputs(g, cfg.inputs, static_params));
 
@@ -303,9 +304,31 @@ void MapInputsAndDetermineDTypes(CompileSpec& cfg, std::shared_ptr<torch::jit::G
     } else if (!est_type_opt && !spec.dtype_is_user_defined) {
       // If we cannot calculate the type and the user did not define the type, then default to FP32
       LOG_WARNING(
-          "Cannot deterime input type from calcuations in graph for input "
+          "Cannot infer input type from calcuations in graph for input "
           << in->debugName() << ". Assuming it is Float32. If not, specify input type explicity");
       spec.dtype = nvinfer1::DataType::kFLOAT;
+    } else if (spec.dtype_is_user_defined && cfg.partition_info.enabled) {
+      if (!est_type_opt) {
+        LOG_INFO("Cannot infer input tensor dtype in graph, unable to verify user input dtype settings");
+      } else {
+        if (util::TRTDataTypeToScalarType(cfg.convert_info.inputs.find(in)->second.dtype) != est_type_opt.value()) {
+          std::stringstream ss;
+          ss <<"For input " << in->debugName() << ", found user specified input dtype as ";
+          ss << cfg.convert_info.inputs.find(in)->second.dtype;
+          ss << ", however when inspecting the graph, the input type expected was inferred to be ";
+          ss << est_type_opt.value() << std::endl;
+          ss << "The compiler is going to use the user setting " << cfg.convert_info.inputs.find(in)->second.dtype;
+          ss << "\nThis conflict may cause an error at runtime due to partial compilation being enabled and therefore\n";
+          ss << "compatibility with PyTorch's data type convention is required.\n";
+          ss << "If you do indeed see errors at runtime either:\n";
+          ss << "- Remove the dtype spec for " << in->debugName() << std::endl;
+          ss << "- Disable partial compilation by setting require_full_compilation to True";
+          auto warn_str = ss.str();
+          LOG_WARNING(warn_str);
+          // Overwrite type map with user settings
+          first_use_type_map[in] = {util::TRTDataTypeToScalarType(cfg.convert_info.inputs.find(in)->second.dtype)};
+        }
+      }
     } else {
       // The user defined the type so no changes are necessary
     }
@@ -317,10 +340,11 @@ std::string ConvertGraphToTRTEngine(const torch::jit::script::Module& mod, std::
   auto graph_and_parameters = lowering::Lower(mod, method_name, cfg.lower_info);
 
   auto g = graph_and_parameters.first;
+  TRTORCH_CHECK(conversion::VerifyConverterSupportForBlock(g->block()), "Not all operations in graph are supported by the compiler");
   auto params = graph_and_parameters.second;
   auto static_params = ir::get_static_params(g->inputs(), params);
   // Infer the type of an input from the weights of the calculation
-  auto first_use_types = util::get_block_first_calc_dtypes_opt(g->block());
+  auto first_use_types = ir::get_block_first_calc_dtypes_opt(g->block());
 
   MapInputsAndDetermineDTypes(cfg, g, static_params, first_use_types);
 
@@ -357,11 +381,21 @@ torch::jit::Module CompileGraph(const torch::jit::Module& mod, CompileSpec cfg)
       auto params = graph_and_parameters.second;
       auto static_params = ir::get_static_params(g->inputs(), params);
       // Infer the type of an input from the weights of the calculation
-      auto first_use_types = util::get_block_first_calc_dtypes_opt(g->block());
+      auto first_use_types = ir::get_block_first_calc_dtypes_opt(g->block());
 
       MapInputsAndDetermineDTypes(cfg, g, static_params, first_use_types);
 
-      if (cfg.partition_info.enabled) {
+      if (cfg.partition_info.enabled
+            && (cfg.lower_info.forced_fallback_modules.size() == 0
+                  && cfg.partition_info.forced_fallback_operators.size() == 0
+                  && conversion::VerifyConverterSupportForBlock(g->block(), true))) {
+        LOG_INFO("Skipping partitioning since model is fully supported");
+      }
+
+      if (cfg.partition_info.enabled
+            && !(cfg.lower_info.forced_fallback_modules.size() == 0
+                  && cfg.partition_info.forced_fallback_operators.size() == 0
+                  && conversion::VerifyConverterSupportForBlock(g->block(), false))) {
         auto input_ivalues_map = partitioning::generateRandomInputs(cfg.convert_info.inputs, first_use_types);
         auto graph_and_mapping = ConstructFallbackGraph(new_mod, g->block(), input_ivalues_map, cfg, static_params);
         new_g = graph_and_mapping.first;
@@ -374,6 +408,7 @@ torch::jit::Module CompileGraph(const torch::jit::Module& mod, CompileSpec cfg)
           return mod;
         }
       } else {
+        TRTORCH_CHECK(conversion::VerifyConverterSupportForBlock(g->block()), "Not all operations in graph are supported by the compiler");
         auto engine = conversion::ConvertBlockToEngine(g->block(), cfg.convert_info, static_params);
         auto device_spec = cfg.convert_info.engine_settings.device;
         auto cuda_device = runtime::CudaDevice(device_spec.gpu_id, device_spec.device_type);

core/conversion/conversion.cpp

@@ -491,7 +491,7 @@ std::set<std::string> ConvertableOpsInBlock(const torch::jit::Block* b) {
   return convertable_ops;
 }
 
-bool VerifyConverterSupportForBlock(const torch::jit::Block* b) {
+bool VerifyConverterSupportForBlock(const torch::jit::Block* b, bool suppress_errors) {
   auto unsupported_ops = GetUnsupportedOpsInBlock(b);
 
   if (unsupported_ops.size() != 0) {
@@ -506,16 +506,20 @@ bool VerifyConverterSupportForBlock(const torch::jit::Block* b) {
     unsupported_msg << "https://www.github.com/nvidia/TRTorch/issues" << std::endl;
     unsupported_msg << std::endl << "In Module:" << std::endl;
 
-    LOG_ERROR(unsupported_msg.str());
+    if (suppress_errors) {
+      LOG_ERROR(unsupported_msg.str());
+    }
 
     for (const auto n : b->nodes()) {
       auto schema = n->maybeSchema();
       if (schema) {
         for (const auto& x : unsupported_ops) {
           if (x.first == schema->operator_name()) {
-            LOG_ERROR(
-                "Unsupported operator: " << *schema << std::endl
-                                         << trtorch::core::util::GetPyTorchSourceCode(n) << std::endl);
+            if (suppress_errors) {
+              LOG_ERROR(
+                  "Unsupported operator: " << *schema << std::endl
+                                          << trtorch::core::util::GetPyTorchSourceCode(n) << std::endl);
+            }
           }
         }
       }
@@ -531,7 +535,9 @@ bool VerifyConverterSupportForBlock(const torch::jit::Block* b) {
     unsupported_msg
         << "This may be because there are no operators that can be added to the TensorRT graph or all operators have a resolved compile time value."
         << std::endl;
-    LOG_ERROR(unsupported_msg.str());
+    if (suppress_errors) {
+      LOG_ERROR(unsupported_msg.str());
+    }
     return false;
   }
 

core/conversion/conversion.h

@@ -25,7 +25,7 @@ std::string ConvertBlockToEngine(
 
 bool OpSupported(const torch::jit::Node* n);
 
-bool VerifyConverterSupportForBlock(const torch::jit::Block* b);
+bool VerifyConverterSupportForBlock(const torch::jit::Block* b, bool suppress_errors=false);
 
 c10::optional<torch::jit::IValue> EvaluateNode(
     ConversionCtx* ctx,

core/ir/ir.cpp

@@ -45,6 +45,109 @@ std::vector<const torch::jit::Value*> get_tensor_inputs(
   return input_tensors;
 }
 
+c10::optional<at::ScalarType> get_value_first_calc_dtype_opt(torch::jit::Block* b, torch::jit::Value* in) {
+  TRTORCH_ASSERT(in->owningGraph() == b->owningGraph(), "Provided input is not part of the provided graph");
+  c10::optional<at::ScalarType> dtype = {};
+
+  auto b_ins = b->inputs();
+  std::unordered_set<torch::jit::Value*> b_in_set(b_ins.begin(), b_ins.end());
+
+  TRTORCH_ASSERT(
+      in->type() == c10::TensorType::get(), "Input is not a tensor, cannot check for dtype based on calculation");
+
+  auto consumers = in->uses();
+  auto search_list = std::vector<torch::jit::Use>(consumers.begin(), consumers.end());
+
+  for (auto& u : search_list) {
+    auto n = u.user;
+    LOG_GRAPH("Node we are looking at: " << util::node_info(n));
+    auto ins = n->inputs();
+    auto outs = n->outputs();
+
+    bool outputs_tensor = false;
+    for (auto o : outs) {
+      if (o->type() == c10::TensorType::get()) {
+        outputs_tensor = true;
+        break;
+      }
+    }
+
+    if (!outputs_tensor) {
+      LOG_GRAPH("Node " << util::node_info(n) << " does not output a tensor, skipping");
+      continue;
+    }
+
+    LOG_GRAPH("Node " << util::node_info(n) << " outputs a tensor");
+
+    // If all input tensors are block inputs then this node will not give us useful type info so move to the next one
+    bool all_n_ins_are_b_ins = true;
+    for (auto in : ins) {
+      if (b_in_set.find(in) == b_in_set.end()) {
+        all_n_ins_are_b_ins = false;
+        break;
+      }
+    }
+
+    if (all_n_ins_are_b_ins) {
+      LOG_GRAPH(
+          "All inputs to Node " << util::node_info(n) << " are graph inputs, cannot be used to determine input type");
+      for (auto o : outs) {
+        if (o->type() == c10::TensorType::get()) {
+          auto o_uses = o->uses();
+          search_list.insert(search_list.end(), o_uses.begin(), o_uses.end());
+        }
+      }
+      continue;
+    }
+
+    // If node outputs a Tensor it might be a result of tensor calcuation so check to see
+    // if any inputs to the calculation can give us hints
+    c10::optional<torch::jit::Node*> const_tensor_n = {};
+
+    // Backtrace to constants which will immediately give us the Tensor type if possible
+    for (auto in : ins) {
+      LOG_GRAPH("Input to node: " << util::node_info(in->node()));
+      if (in->type()->isSubtypeOf(torch::jit::TensorType::get())) {
+        LOG_GRAPH("Input outputs a Tensor");
+        if (in->node()->kind() == torch::jit::prim::Constant) {
+          LOG_GRAPH("Input is a constant");
+          auto const_val = in->node()->t(c10::attr::value);
+          LOG_GRAPH("Found that constant tensor has type: " << const_val.scalar_type());
+          dtype = {const_val.scalar_type()};
+          goto exit_first_calc_dtype;
+        }
+      }
+    }
+
+    // Add all tensor outputs to search list if we still dont know
+    for (auto o : outs) {
+      if (o->type() == c10::TensorType::get()) {
+        auto o_uses = o->uses();
+        search_list.insert(search_list.end(), o_uses.begin(), o_uses.end());
+      }
+    }
+  }
+exit_first_calc_dtype:
+  if (dtype) {
+    LOG_GRAPH("Estimated input type is " << dtype.value());
+  } else {
+    LOG_GRAPH("Cannot determine input types from graph");
+  }
+  return dtype;
+}
+
+TypeMap get_block_first_calc_dtypes_opt(torch::jit::Block* b) {
+  TypeMap types;
+
+  for (auto i : b->inputs()) {
+    if (i->type() == c10::TensorType::get()) {
+      torch::jit::Value* in = i;
+      types.insert({in, get_value_first_calc_dtype_opt(b, i)});
+    }
+  }
+  return types;
+}
+
 } // namespace ir
 } // namespace core
 } // namespace trtorch

core/ir/ir.h

@@ -52,6 +52,11 @@ std::vector<const torch::jit::Value*> get_tensor_inputs(
     std::shared_ptr<torch::jit::Graph>& g,
     StaticParams& static_params);
 
+using TypeMap = std::unordered_map<const torch::jit::Value*, c10::optional<at::ScalarType>>;
+
+c10::optional<at::ScalarType> get_value_first_calc_dtype_opt(torch::jit::Block* b, torch::jit::Value* in);
+ir::TypeMap get_block_first_calc_dtypes_opt(torch::jit::Block* b);
+
 } // namespace ir
 } // namespace core
 } // namespace trtorch

core/lowering/LowerInfo.cpp

@@ -10,7 +10,7 @@ namespace lowering {
 
 std::ostream& operator<<(std::ostream& os, const LowerInfo& l) {
   os << "Settings requested for Lowering:" << std::endl;
-  os << "    Forced Fallback Modules: [" << std::endl;
+  os << "    torch_executed_modules: [" << std::endl;
   for (auto i : l.forced_fallback_modules) {
     os << "      " << i << std::endl;
   }

core/partitioning/PartitionInfo.cpp

@@ -14,7 +14,7 @@ std::ostream& operator<<(std::ostream& os, const PartitionInfo& s) {
   if (s.enabled) {
     os << "True";
     os << "\n    \"min_block_size\": " << s.min_block_size \
-       << "\n    \"forced_fallback_operators\": [";
+       << "\n    \"torch_executed_operators\": [";
     for (auto i : s.forced_fallback_operators) {
       os <<"\n        " << i << ',';
     }

core/util/BUILD

@@ -27,9 +27,6 @@ cc_library(
     hdrs = [
         "jit_util.h",
     ],
-    srcs = [
-        "jit_util.cpp"
-    ],
     deps = [
         ":macros"
     ] + select({

core/util/jit_util.h

@@ -9,7 +9,6 @@ namespace trtorch {
 namespace core {
 namespace util {
 
-using InputTypeMap = std::unordered_map<const torch::jit::Value*, c10::optional<at::ScalarType>>;
 
 inline std::string node_info(const torch::jit::Node* n) {
   std::stringstream ss;
@@ -62,9 +61,6 @@ inline std::string GetPyTorchSourceCode(const torch::jit::Node* n) {
   return source_code;
 }
 
-c10::optional<at::ScalarType> get_value_first_calc_dtype_opt(torch::jit::Block* b, torch::jit::Value* in);
-InputTypeMap get_block_first_calc_dtypes_opt(torch::jit::Block* b);
-
 } // namespace util
 } // namespace core
 } // namespace trtorch

core/util/logging/TRTorchLogger.cpp

@@ -125,9 +125,9 @@ namespace {
 
 TRTorchLogger& get_global_logger() {
 #ifndef NDEBUG
-  static TRTorchLogger global_logger("[TRTorch - Debug Build] - ", LogLevel::kGRAPH, true);
+  static TRTorchLogger global_logger("[TRTorch - Debug Build] - ", LogLevel::kDEBUG, true);
 #else
-  static TRTorchLogger global_logger("[TRTorch] - ", LogLevel::kERROR, false);
+  static TRTorchLogger global_logger("[TRTorch] - ", LogLevel::kWARNING, false);
 #endif
   return global_logger;
 }