Minimize number of copy call

src/operator/Slice.cpp

@@ -63,15 +63,31 @@ void Aidge::Slice_OpImpl::forward() {
         prodInputDims[nbDims - i] = prodInputDims[nbDims - i + 1] * inputDims[nbDims - i];
     }
 
-    std::size_t j = 0;
-    std::size_t i = 0;
-    for (; j < prodSlicedDims[0];) {
-        op.getOutput(0)->getImpl()->copy(op.getInput(0)->getImpl()->rawPtr(beginning + i), 1, j);
+    std::size_t i = beginning;
+    std::size_t size = 0;
+    std::size_t offset = 0;
+    for (std::size_t j = 0; j < prodSlicedDims[0];) {
+        ++size;
         ++i;
         ++j;
+        bool newChunk = false;
         for (std::size_t idx = nbDims - 1; idx > 0; --idx) {
-            i += j % prodSlicedDims[idx] == 0 ? substractedDims[idx] * prodInputDims[idx + 1] : 0;
+            if (j % prodSlicedDims[idx] == 0) {
+                i += substractedDims[idx] * prodInputDims[idx + 1];
+                newChunk = true;
+            }
         }
+
+        if (newChunk) {
+            op.getOutput(0)->getImpl()->copy(op.getInput(0)->getImpl()->rawPtr(beginning), size, offset);
+            beginning = i;
+            offset += size;
+            size = 0;
+        }
+    }
+
+    if (size > 0) {
+        op.getOutput(0)->getImpl()->copy(op.getInput(0)->getImpl()->rawPtr(beginning), size, offset);
     }
 }