Revert "Move outplace ops to ATen (#12413)" (#16731)

Summary:
This reverts commit f660d3ae19decc64390e894fbaf8de80d87585e0.

cc zasdfgbnm

Reasoning at https://github.com/pytorch/pytorch/pull/12413#issuecomment-460424129
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16731

Differential Revision: D13948022

Pulled By: ezyang

fbshipit-source-id: b10669cf03679e306850314b7b5b08bed0839e19

2 files changed, 35 insertions, 49 deletions

diff --git a/torch/_tensor_docs.py b/torch/_tensor_docs.py
index a94a633e34..ba0e31f8fb 100644
--- a/torch/_tensor_docs.py
+++ b/torch/_tensor_docs.py
@@ -2962,55 +2962,6 @@ pinverse() -> Tensor
 See :func:`torch.pinverse`
 """)
 
-add_docstr_all('index_add',
-               r"""
-index_add(dim, index, tensor) -> Tensor
-
-Out-of-place version of :meth:`torch.Tensor.index_add_`
-""")
-
-add_docstr_all('index_copy',
-               r"""
-index_copy(dim, index, tensor) -> Tensor
-
-Out-of-place version of :meth:`torch.Tensor.index_copy_`
-""")
-
-add_docstr_all('index_fill',
-               r"""
-index_fill(dim, index, value) -> Tensor
-
-Out-of-place version of :meth:`torch.Tensor.index_fill_`
-""")
-
-add_docstr_all('scatter',
-               r"""
-scatter(dim, index, source) -> Tensor
-
-Out-of-place version of :meth:`torch.Tensor.scatter_`
-""")
-
-add_docstr_all('scatter_add',
-               r"""
-scatter_add(dim, index, source) -> Tensor
-
-Out-of-place version of :meth:`torch.Tensor.scatter_add_`
-""")
-
-add_docstr_all('masked_scatter',
-               r"""
-masked_scatter(mask, tensor) -> Tensor
-
-Out-of-place version of :meth:`torch.Tensor.masked_scatter_`
-""")
-
-add_docstr_all('masked_fill',
-               r"""
-masked_fill(mask, value) -> Tensor
-
-Out-of-place version of :meth:`torch.Tensor.masked_fill_`
-""")
-
 add_docstr_all('grad',
                r"""
 This attribute is ``None`` by default and becomes a Tensor the first time a call to
diff --git a/torch/tensor.py b/torch/tensor.py
index 0cd19ba60b..2ed379cada 100644
--- a/torch/tensor.py
+++ b/torch/tensor.py
@@ -307,6 +307,41 @@ class Tensor(torch._C._TensorBase):
         else:
             return super(Tensor, self).split_with_sizes(split_size, dim)
 
+    def index_add(self, dim, index, tensor):
+        r"""Out-of-place version of :meth:`torch.Tensor.index_add_`
+        """
+        return self.clone().index_add_(dim, index, tensor)
+
+    def index_copy(self, dim, index, tensor):
+        r"""Out-of-place version of :meth:`torch.Tensor.index_copy_`
+        """
+        return self.clone().index_copy_(dim, index, tensor)
+
+    def index_fill(self, dim, index, value):
+        r"""Out-of-place version of :meth:`torch.Tensor.index_fill_`
+        """
+        return self.clone().index_fill_(dim, index, value)
+
+    def scatter(self, dim, index, source):
+        r"""Out-of-place version of :meth:`torch.Tensor.scatter_`
+        """
+        return self.clone().scatter_(dim, index, source)
+
+    def scatter_add(self, dim, index, source):
+        r"""Out-of-place version of :meth:`torch.Tensor.scatter_add_`
+        """
+        return self.clone().scatter_add_(dim, index, source)
+
+    def masked_scatter(self, mask, tensor):
+        r"""Out-of-place version of :meth:`torch.Tensor.masked_scatter_`
+        """
+        return self.clone().masked_scatter_(mask, tensor)
+
+    def masked_fill(self, mask, value):
+        r"""Out-of-place version of :meth:`torch.Tensor.masked_fill_`
+        """
+        return self.clone().masked_fill_(mask, value)
+
     def unique(self, sorted=True, return_inverse=False, dim=None):
         r"""Returns the unique scalar elements of the tensor as a 1-D tensor.