Merge pull request #25409 from Abdurrahheem:ash/0D-tile-test

0/1D test for tile layer #25409

This PR introduces `0/1D` test for `Tile` layer. It also add fuctionality to support `0/1D` cases.  


### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/dnn/src/layers/tile_layer.cpp

@@ -42,14 +42,20 @@ public:
         CV_CheckEQ(inputs.size(), 1ull, "Tile: one input is expected");
 
         // repeats must have the same length as input's dimension number
-        // FIXIT: it breaks when the input is 1d tensor (represented as 2d mat with size=2 in opencv dnn)
-        CV_CheckEQ(inputs[0].size(), repeats.size(), "Tile: repeats must be a 1D tensor of the same length as input's dimension number");
-
-        outputs.assign(1, inputs[0]);
-        for (int i = 0; i < repeats.size(); i++)
-        {
-            outputs[0][i] *= repeats[i];
+        if (inputs[0].size() > 1) {
+            CV_CheckEQ(inputs[0].size(), repeats.size(), "Tile: repeats must be a 1D tensor of the same length as input's dimension number");
+            outputs.assign(1, inputs[0]);
+            for (int i = 0; i < repeats.size(); i++)
+            {
+                outputs[0][i] *= repeats[i];
+            }
+        } else {
+            CV_CheckGE((int)repeats.size(), 1, "Tile: Provide at least one repeat along any dimension");
+            outputs.assign(1, repeats);
+            if (inputs[0].size() == 1)
+                outputs[0][repeats.size() - 1] *= inputs[0][0];
         }
+
         return false;
     }
 
@@ -79,18 +85,26 @@ public:
         MatShape out_shape = shape(out);
         int rep_i, ndims = data.dims;
         int dims = 1;
-        for (int i = 0; i < ndims; i++)
-        {
-            rep_i = repeats[i];
-            if (rep_i != 1)
+        if (ndims > 1){
+            for (int i = 0; i < ndims; i++)
             {
+                rep_i = repeats[i];
+                if (rep_i != 1)
+                {
+                    tmp = tmp.reshape(0, dims);
+                    tmp = cv::repeat(tmp, 1, rep_i);
+                }
+                dims *= out_shape[i];
+            }
+            tmp = tmp.reshape(0, out_shape);
+        } else {
+            for (int i = 0; i < repeats.size(); i++){
                 tmp = tmp.reshape(0, dims);
-                tmp = cv::repeat(tmp, 1, rep_i);
+                tmp = cv::repeat(tmp, repeats[i], 1);
+                dims *= out_shape[i];
             }
-            dims *= out_shape[i];
+            tmp = tmp.reshape(0, out_shape);
         }
-        tmp = tmp.reshape(0, out_shape);
-
         tmp.copyTo(out);
     }
 

modules/dnn/test/test_layers_1d.cpp

@@ -682,6 +682,48 @@ INSTANTIATE_TEST_CASE_P(/*nothing*/, Layer_Const_Test, testing::Values(
     std::vector<int>({4, 1})
     ));
 
+typedef testing::TestWithParam<std::vector<int>> Layer_Tile_Test;
+TEST_P(Layer_Tile_Test, Accuracy_01D){
+
+    std::vector<int> input_shape = GetParam();
+    std::vector<int> repeats = {2, 2};
+
+    LayerParams lp;
+    lp.type = "Tile";
+    lp.name = "TileLayer";
+    lp.set("repeats", DictValue::arrayInt(repeats.data(), repeats.size()));
+    Ptr<TileLayer> layer = TileLayer::create(lp);
+
+    cv::Mat input = cv::Mat(input_shape.size(), input_shape.data(), CV_32F);
+    cv::randn(input, 0, 1);
+
+    std::vector<Mat> inputs{input};
+    std::vector<Mat> outputs;
+
+    runLayer(layer, inputs, outputs);
+
+    // Manually create the expected output for verification
+    cv::Mat output_ref = input.clone();
+    for (int i = 0; i < repeats.size(); ++i) {
+        cv::Mat tmp;
+        cv::repeat(output_ref, (i == 0 ? repeats[i] : 1), (i == 1 ? repeats[i] : 1), tmp);
+        output_ref = tmp;
+    }
+
+    ASSERT_EQ(outputs.size(), 1);
+    ASSERT_EQ(shape(outputs[0]), shape(output_ref));
+    normAssert(output_ref, outputs[0]);
+
+}
+INSTANTIATE_TEST_CASE_P(/*nothing*/, Layer_Tile_Test,
+/*input blob shape*/    testing::Values(
+        std::vector<int>({}),
+        std::vector<int>({2}),
+        std::vector<int>({2, 1}),
+        std::vector<int>({1, 2}),
+        std::vector<int>({2, 2})
+        ));
+
 typedef testing::TestWithParam<tuple<std::vector<int>, std::string>> Layer_Einsum_Test;
 TEST_P(Layer_Einsum_Test, Accuracy_01D)
 {