feat: support truncate long/double to int/float with option

Signed-off-by: inocsin <vcheungyi@163.com>

Author: inocsin

core/conversion/conversionctx/ConversionCtx.h

@@ -28,6 +28,7 @@ struct BuilderSettings {
   bool refit = false;
   bool debug = false;
   bool strict_types = false;
+  bool truncate_long_and_double = false;
   Device device;
   nvinfer1::EngineCapability capability = nvinfer1::EngineCapability::kDEFAULT;
   nvinfer1::IInt8Calibrator* calibrator = nullptr;

core/conversion/var/Var.cpp

@@ -94,10 +94,18 @@ nvinfer1::ITensor* Var::ITensorOrFreeze(ConversionCtx* ctx) {
       "Requested either IValue containing a Tensor, or ITensor, however Var type is " << type_name());
 
   nvinfer1::ITensor* out;
-
+  auto weights = converters::Weights();
   if (isIValue()) {
-    auto weights = converters::Weights(ctx, ptr_.ivalue->toTensor());
-
+    auto tensor = ptr_.ivalue->toTensor();
+    if (tensor.scalar_type() == at::kLong && ctx->settings.truncate_long_and_double) {
+      weights = converters::Weights(ctx, tensor.toType(at::kInt));
+      LOG_WARNING("Truncate kLong to kInt for IValue");
+    } else if (tensor.scalar_type() == at::kDouble && ctx->settings.truncate_long_and_double) {
+      weights = converters::Weights(ctx, tensor.toType(at::kFloat));
+      LOG_WARNING("Truncate kDouble to kFloat for IValue");
+    } else {
+      weights = converters::Weights(ctx, tensor);
+    }
     auto const_layer = ctx->net->addConstant(weights.shape, weights.data);
     TRTORCH_CHECK(const_layer, "Unable to freeze tensor into constant layer");
 

cpp/api/include/trtorch/trtorch.h

@@ -258,6 +258,11 @@ struct TRTORCH_API CompileSpec {
    */
   bool debug = false;
 
+  /**
+   * Truncate long/double type to int/float type
+   */
+  bool truncate_long_and_double = false;
+
   /**
    * Restrict operating type to only set default operation precision
    * (op_precision)

cpp/api/src/compile_spec.cpp

@@ -92,6 +92,7 @@ core::CompileSpec to_internal_compile_spec(CompileSpec external) {
   internal.convert_info.engine_settings.disable_tf32 = external.disable_tf32;
   internal.convert_info.engine_settings.refit = external.refit;
   internal.convert_info.engine_settings.debug = external.debug;
+  internal.convert_info.engine_settings.truncate_long_and_double = external.truncate_long_and_double;
   internal.convert_info.engine_settings.strict_types = external.strict_types;
   internal.convert_info.engine_settings.device.allow_gpu_fallback = external.device.allow_gpu_fallback;
   internal.convert_info.engine_settings.max_batch_size = external.max_batch_size;