Support Half/BFloat16 in topk (#7755)

Partial fix for #7748.

Author: swolchok

kernels/portable/cpu/op_topk.cpp

@@ -186,7 +186,7 @@ std::tuple<Tensor&, Tensor&> topk_values(
 
   bool temp_mem_allocated = false;
 
-  ET_SWITCH_REALH_TYPES(in.scalar_type(), ctx, name, CTYPE, [&]() {
+  ET_SWITCH_REALHBF16_TYPES(in.scalar_type(), ctx, name, CTYPE, [&]() {
     using elem_t = std::pair<CTYPE, int64_t>;
     size_t temp_mem_size = nonempty_size(in, dim) * sizeof(elem_t);
 

kernels/test/CMakeLists.txt

@@ -220,6 +220,7 @@ set(all_test_sources
     "op_tan_test.cpp"
     "op_tanh_test.cpp"
     "op_to_copy_test.cpp"
+    "op_topk_test.cpp"
     "op_transpose_copy_test.cpp"
     "op_tril_test.cpp"
     "op_trunc_test.cpp"

kernels/test/op_topk_test.cpp

@@ -118,32 +118,39 @@ class OpTopkValuesTest : public ::testing::Test {
     // first.
     torch::executor::runtime_init();
   }
+
+  template <ScalarType DTYPE>
+  void run_smoke_test() {
+    TensorFactory<DTYPE> tfDtype;
+    TensorFactory<ScalarType::Long> tfLong;
+
+    Tensor input =
+        tfDtype.make({3, 2, 2}, {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12});
+    int64_t k = 2;
+    int64_t dim = 0;
+    bool largest = true;
+    bool sorted = true;
+    Tensor values = tfDtype.zeros({2, 2, 2});
+    Tensor indices = tfLong.zeros({2, 2, 2});
+    Tensor values_expected =
+        tfDtype.make({2, 2, 2}, {9, 10, 11, 12, 5, 6, 7, 8});
+    Tensor indices_expected = tfLong.make({2, 2, 2}, {2, 2, 2, 2, 1, 1, 1, 1});
+    op_topk_values(input, k, dim, largest, sorted, values, indices);
+    EXPECT_TENSOR_CLOSE(values, values_expected);
+    EXPECT_TENSOR_EQ(indices, indices_expected);
+
+    largest = false;
+    values_expected = tfDtype.make({2, 2, 2}, {1, 2, 3, 4, 5, 6, 7, 8});
+    indices_expected = tfLong.make({2, 2, 2}, {0, 0, 0, 0, 1, 1, 1, 1});
+    op_topk_values(input, k, dim, largest, sorted, values, indices);
+    EXPECT_TENSOR_CLOSE(values, values_expected);
+    EXPECT_TENSOR_EQ(indices, indices_expected);
+  }
 };
 
 TEST_F(OpTopkValuesTest, SmokeTest) {
-  TensorFactory<ScalarType::Float> tfFloat;
-  TensorFactory<ScalarType::Long> tfLong;
-
-  Tensor input =
-      tfFloat.make({3, 2, 2}, {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12});
-  int64_t k = 2;
-  int64_t dim = 0;
-  bool largest = true;
-  bool sorted = true;
-  Tensor values = tfFloat.zeros({2, 2, 2});
-  Tensor indices = tfLong.zeros({2, 2, 2});
-  Tensor values_expected = tfFloat.make({2, 2, 2}, {9, 10, 11, 12, 5, 6, 7, 8});
-  Tensor indices_expected = tfLong.make({2, 2, 2}, {2, 2, 2, 2, 1, 1, 1, 1});
-  op_topk_values(input, k, dim, largest, sorted, values, indices);
-  EXPECT_TENSOR_CLOSE(values, values_expected);
-  EXPECT_TENSOR_EQ(indices, indices_expected);
-
-  largest = false;
-  values_expected = tfFloat.make({2, 2, 2}, {1, 2, 3, 4, 5, 6, 7, 8});
-  indices_expected = tfLong.make({2, 2, 2}, {0, 0, 0, 0, 1, 1, 1, 1});
-  op_topk_values(input, k, dim, largest, sorted, values, indices);
-  EXPECT_TENSOR_CLOSE(values, values_expected);
-  EXPECT_TENSOR_EQ(indices, indices_expected);
+#define RUN_SMOKE_TEST(ctype, dtype) run_smoke_test<ScalarType::dtype>();
+  ET_FORALL_REALHBF16_TYPES(RUN_SMOKE_TEST);
 }
 
 TEST_F(OpTopkValuesTest, NonPartialSort) {