diff --git a/imperative/python/megengine/functional/nn.py b/imperative/python/megengine/functional/nn.py
index 36f13632e75abc32ff78285561355ddecb69797e..9ababcebee4d4fc420072887084b9480396d2df4 100644
--- a/imperative/python/megengine/functional/nn.py
+++ b/imperative/python/megengine/functional/nn.py
@@ -1587,7 +1587,9 @@ def one_hot(inp: Tensor, num_classes: int) -> Tensor:
              [0 0 1 0]
              [0 0 0 1]]
     """
-    zeros_tensor = zeros(list(inp.shape) + [num_classes], dtype=inp.dtype, device=inp.device)
+    zeros_tensor = zeros(
+        list(inp.shape) + [num_classes], dtype=inp.dtype, device=inp.device
+    )
     ones_tensor = ones(list(inp.shape) + [1], dtype=inp.dtype, device=inp.device)
 
     op = builtin.IndexingSetOneHot(axis=inp.ndim)
diff --git a/imperative/python/megengine/functional/tensor.py b/imperative/python/megengine/functional/tensor.py
index c1369abfb81f463e38ef5650b067cd2f27f5a08d..e8ff2e6a2da9addf02860e967aeaa3daae2c5dc5 100755
--- a/imperative/python/megengine/functional/tensor.py
+++ b/imperative/python/megengine/functional/tensor.py
@@ -195,28 +195,14 @@ def ones(
     return full(shape, 1.0, dtype=dtype, device=device)
 
 
-def zeros(
-    shape: Union[int, Tuple[int, ...]],
-    *,
-    dtype="float32",
-    device: Optional[CompNode] = None
-) -> Tensor:
-    r"""Returns a new tensor having a specified shape and filled with zeros.
+def zeros(shape, dtype="float32", device=None) -> Tensor:
+    r"""Returns a zero tensor with given shape.
 
     Args:
-        shape (int or sequence of ints): the shape of the output tensor.
-
-    Keyword args:
-        dtype (:attr:`.Tensor.dtype`): output tensor data type. Default: ``float32``.
-        device (:attr:`.Tensor.device`): device on which to place the created tensor. Default: ``None``.
-
-    Returns:
-        a tensor containing zeros.
-
-    Examples:
-        >>> F.zeros((2, 1))
-        Tensor([[0.]
-         [0.]], device=xpux:0)
+        shape: a list, tuple or integer defining the shape of the output tensor.
+        dtype: the desired data type of the output tensor. Default: ``float32``.
+        device: the desired device of the output tensor. Default: if ``None``,
+            use the default device (see :func:`~.megengine.get_default_device`).
     """
     return full(shape, 0.0, dtype=dtype, device=device)