Implement simple input layer

test/layers/test_input.cu

@@ -0,0 +1,16 @@
+#include <gtest/gtest.h>
+
+#include "input.cuh"
+#include "cuda_helper.cuh"
+
+
+TEST(InputLayerTest, Init) {
+    std::vector<float> input = {0.573f, 0.619f, 0.732f, 0.055f, 0.243f, 0.316f};
+    Layers::Input inputLayer(6);
+    float* d_output = inputLayer.forward(input.data());
+
+    std::vector<float> output(6);
+    CUDA_CHECK(cudaMemcpy(output.data(), d_output, sizeof(float) * 6, cudaMemcpyDeviceToHost));
+    EXPECT_EQ(input, output);
+
+}