scatter/gather - check that inputs are of the same dimensionality (pytorch#41890)

Co-authored-by: Nikita Vedeneev <[email protected]>

Author: gchanan

aten/src/ATen/native/ScatterGatherChecks.h

@@ -34,12 +34,17 @@ static void scatter_gather_dtype_check(
 // Test:
 // 1. index.size(d) == self.size(d) for all d != dim
 // 2. index.size(d) <= src.size(d) for all d != dim
+// 3. index.dim() == self.dim() == src.dim()
 static void gather_shape_check(const Tensor& self, int64_t dim,
   const Tensor& index, const Tensor& src
 ) {
   auto self_dims = ensure_nonempty_dim(self.dim());
-
   TORCH_CHECK(self_dims == ensure_nonempty_dim(index.dim()),
+    "Index tensor must have the same number of dimensions as out tensor"
+  );
+
+  auto src_dims = ensure_nonempty_dim(src.dim());
+  TORCH_CHECK(src_dims == ensure_nonempty_dim(index.dim()),
     "Index tensor must have the same number of dimensions as input tensor"
   );
 
@@ -66,10 +71,16 @@ static void gather_shape_check(const Tensor& self, int64_t dim,
 // Tests:
 //  1. index.size(d) <= self.size(d) for all d != dim
 //  2. index.size(d) <= src.size(d) for all d if src is a Tensor
+//  3. index.dim() == self.dim() == src.dim()
 static void scatter_shape_check(
   const Tensor& self, int64_t dim, const Tensor& index,
   const c10::optional<Tensor>& src_opt = c10::nullopt
 ) {
+  TORCH_CHECK(
+    ensure_nonempty_dim(self.dim()) == ensure_nonempty_dim(index.dim()),
+    "Index tensor must have the same number of dimensions as self tensor"
+  );
+
   bool is_wrong_shape = false;
   int64_t self_dims = ensure_nonempty_dim(self.dim());
 
@@ -97,6 +108,12 @@ static void scatter_shape_check(
 
   if (src_opt.has_value()) {
     auto src = src_opt.value();
+
+    TORCH_CHECK(
+      ensure_nonempty_dim(src.dim()) == ensure_nonempty_dim(index.dim()),
+      "Index tensor must have the same number of dimensions as src tensor"
+    );
+
     TORCH_CHECK(!is_wrong_shape,
       "Expected index ", index.sizes(),
       " to be smaller than self ", self.sizes(),

test/test_torch.py

@@ -2643,6 +2643,13 @@ def _test_gather(self, cast, test_bounds=True):
             with self.assertRaisesRegex(RuntimeError, 'Expected self.dtype to be equal to src.dtype'):
                 torch.gather(src, dim, idx, out=expected.to(torch.int))
 
+            # checks for the same dimensionality
+            with self.assertRaisesRegex(RuntimeError, 'Index tensor must have the same number of dimensions as input tensor'):
+                torch.gather(src, dim, idx.unsqueeze(-1))
+
+            with self.assertRaisesRegex(RuntimeError, 'Index tensor must have the same number of dimensions as input tensor'):
+                torch.gather(src.unsqueeze(-1), dim, idx)
+
             if test_bounds:
                 idx[0][0][0] = 23
                 self.assertRaises(RuntimeError, lambda: torch.gather(src, dim, idx))
@@ -2728,6 +2735,17 @@ def _test_scatter_base(self, cast, method, is_scalar=False, test_bounds=True, *,
                 with self.assertRaisesRegex(RuntimeError, 'Expected dtype int64 for index'):
                     getattr(base.clone(), method)(dim, idx.type(torch.int), src)
 
+                # check for the same dimensionality
+                with self.assertRaisesRegex(RuntimeError, 'Index tensor must have the same number of dimensions as self tensor'):
+                    getattr(base.clone().unsqueeze(-1), method)(dim, idx, src)
+
+                with self.assertRaisesRegex(RuntimeError, 'Index tensor must have the same number of dimensions as self tensor'):
+                    getattr(base.clone(), method)(dim, idx.unsqueeze(-1), src)
+
+                if not is_scalar:
+                    with self.assertRaisesRegex(RuntimeError, 'Index tensor must have the same number of dimensions as src tensor'):
+                        getattr(base.clone(), method)(dim, idx, src.unsqueeze(-1))
+
                 if test_bounds:
                     idx[0][0][0] = 34
                     with self.assertRaises(RuntimeError):