minor cleanups

src/operator/Gather.cpp

@@ -22,10 +22,13 @@ const std::string Aidge::Gather_Op::Type = "Gather";
 
 void Aidge::Gather_Op::computeOutputDims() {
     // check inputs have been associated
-    if (!getInput(0) || !getInput(1)) {
-        AIDGE_THROW_OR_ABORT(std::runtime_error, "At least one input was not connected");
+    for(int i=0; i<2; ++i){
+        if (!getInput(i)) {
+            AIDGE_THROW_OR_ABORT(std::runtime_error, "{}: input #{} should be associated with a Tensor", type(), i);
+        }
     }
 
+
     if (!getInput(0)->empty() && !getInput(1)->empty()) {
         std::vector<DimSize_t> outDims = getInput(0)->dims();
         std::vector<DimSize_t> indicesDims = getInput(1)->dims();

src/operator/Slice.cpp

@@ -24,9 +24,11 @@
 const std::string Aidge::Slice_Op::Type = "Slice";
 
 void Aidge::Slice_Op::computeOutputDims() {
-    // check input have been associated
-    if (!getInput(0) || !getInput(1) || !getInput(2) || !getInput(3)) {
-        AIDGE_THROW_OR_ABORT(std::runtime_error, "Every input should be associated with a Tensor");
+    // check inputs have been associated
+    for(int i=0; i<4; ++i){
+        if (!getInput(i)) {
+            AIDGE_THROW_OR_ABORT(std::runtime_error, "{}: input #{} should be associated with a Tensor", type(), i);
+        }
     }
 
     if((!getInput(0)->empty()) && (!getInput(1)->empty()) && (!getInput(2)->empty()) && (!getInput(3)->empty()))