fix: fix aten::sub.scalar operator

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

Author: peri044

core/conversion/converters/impl/element_wise.cpp

@@ -191,23 +191,16 @@ auto element_wise_registrations TRTORCH_UNUSED =
                     auto self = args[0].ITensorOrFreeze(ctx);
                     auto other = args[1].unwrapToScalar().to<float>();
                     auto alpha = args[2].unwrapToScalar().to<float>();
+                    auto scaled_val = other * alpha;
 
-                    auto rhs = other * alpha;
-                    if (1 != rhs) {
-                      auto rhs_tensor = tensor_to_const(ctx, torch::tensor({rhs}));
-                      auto sub = add_elementwise(ctx, nvinfer1::ElementWiseOperation::kSUB, self, rhs_tensor, util::node_info(n));
-                      TRTORCH_CHECK(sub, "Unable to create sub layer from node: " << *n);
-                      sub->setName(util::node_info(n).c_str());
-                      LOG_DEBUG("Output tensor shape: " << sub->getOutput(0)->getDimensions());
-                      ctx->AssociateValueAndTensor(n->outputs()[0], sub->getOutput(0));
-                      return true;
-                    } else {
-                      LOG_DEBUG("Nothing to be done this layer, passing through input");
-                      LOG_DEBUG("Output tensor shape: " << self->getDimensions());
-
-                      ctx->AssociateValueAndTensor(n->outputs()[0], self);
-                      return true;
-                    }
+                    auto scaled_other_tensor = tensor_to_const(ctx, torch::tensor({scaled_val}));
+                    auto sub = add_elementwise(ctx, nvinfer1::ElementWiseOperation::kSUB, self, scaled_other_tensor, util::node_info(n));
+                    TRTORCH_CHECK(sub, "Unable to create sub layer from node: " << *n);
+                    sub->setName(util::node_info(n).c_str());
+                    LOG_DEBUG("Output tensor shape: " << sub->getOutput(0)->getDimensions());
+                    ctx->AssociateValueAndTensor(n->outputs()[0], sub->getOutput(0));
+
+                    return true;
                   }})
         .pattern({"aten::sub_.Tensor(Tensor(a!) self, Tensor other, *, Scalar "
                   "alpha=1) -> (Tensor(a!))",