Cast BOOL concats to INT32 (#620)

Signed-off-by: Kevin Chen <kevinch@nvidia.com>

Author: kevinch-nv

builtin_op_importers.cpp

@@ -354,11 +354,17 @@ DEFINE_BUILTIN_OP_IMPORTER(Clip)
 DEFINE_BUILTIN_OP_IMPORTER(Concat)
 {
     std::vector<nvinfer1::ITensor*> tensors;
+    // Cast boolean inputs to INT32
+    bool isBool = false;
     for (auto& input : inputs)
     {
-        // TRT does not support BOOL input types for this node
-        ASSERT(!input.isBool(), ErrorCode::kUNSUPPORTED_NODE);
-        tensors.push_back(&convertToTensor(input, ctx));
+        auto* tensorPtr = &convertToTensor(input, ctx);
+        if (tensorPtr->getType() == nvinfer1::DataType::kBOOL)
+        {
+            tensorPtr = castHelper(ctx, tensorPtr, nvinfer1::DataType::kINT32);
+            isBool = true;
+        }
+        tensors.push_back(tensorPtr);
     }
     OnnxAttrs attrs(node, ctx);
     int axis = attrs.get<int>("axis");
@@ -368,6 +374,12 @@ DEFINE_BUILTIN_OP_IMPORTER(Concat)
     ctx->registerLayer(layer, node.name());
     ASSERT(layer, ErrorCode::kUNSUPPORTED_NODE);
     layer->setAxis(axis);
+
+    if (isBool)
+    {
+        return {{castHelper(ctx, layer->getOutput(0), nvinfer1::DataType::kBOOL)}};
+    }
+
     RETURN_FIRST_OUTPUT(layer);
 }
 

onnx2trt_utils.cpp

@@ -152,6 +152,13 @@ bool canUseLinearResize(const size_t scaleSize, const float* scaleFactors)
     return true;
 }
 
+nvinfer1::ITensor* castHelper(IImporterContext* ctx, nvinfer1::ITensor* input, nvinfer1::DataType dtype)
+{
+    nvinfer1::IIdentityLayer* cast = ctx->network()->addIdentity(*input);
+    cast->setOutputType(0, dtype);
+    return cast->getOutput(0);
+}
+
 nvinfer1::ITensor* constantOfShape(IImporterContext* ctx, const ::ONNX_NAMESPACE::NodeProto& node, nvinfer1::ITensor* constant, nvinfer1::ITensor* shape)
 {
     int rank = shape->getDimensions().d[0];

onnx2trt_utils.hpp

@@ -154,6 +154,9 @@ Status broadcastTensors(IImporterContext* ctx, nvinfer1::ITensor*& t1, nvinfer1:
 // Helper function to check that linear resize can be used
 bool canUseLinearResize(const size_t scaleSize, const float* scaleFactors);
 
+// Helper function to add a Cast layer in the network
+nvinfer1::ITensor* castHelper(IImporterContext* ctx, nvinfer1::ITensor* input, nvinfer1::DataType dtype);
+
 // Helper function for constantOfShape operator. Input shape must be a shape tensor
 nvinfer1::ITensor* constantOfShape(IImporterContext* ctx, const ::ONNX_NAMESPACE::NodeProto& node, nvinfer1::ITensor* constant, nvinfer1::ITensor* shape);