Update the demo code and the doc of varbase.backward. #26506

wzzju · 2020-08-20T13:17:19Z

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Update the demo code and the doc of varbase.backward. The pr of FluidDoc about backward.

Variable.backward

paddle.grad

paddle-bot-old · 2020-08-20T13:17:26Z

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zhhsplendid · 2020-08-21T10:13:39Z

paddle/fluid/pybind/imperative.cc

@@ -513,28 +513,30 @@ void BindImperative(py::module *m_ptr) {
    Attribute:
        **sort_sum_gradient**:

-        If framework will sum the gradient by the reverse order of trace. eg. x_var ( :ref:`api_guide_Variable` ) will be the input of multiple OP such as :ref:`api_fluid_layers_scale` , this attr will decide if framework will sum gradient of `x_var` by the reverse order.
+        If framework will sum gradients by the reverse order of the forward execution sequence. 


"If True, framework will ..."

Otherwise this sentence doesn't make sense.

zhhsplendid · 2020-08-21T10:34:15Z

paddle/fluid/pybind/imperative.cc

@@ -513,28 +513,30 @@ void BindImperative(py::module *m_ptr) {
    Attribute:
        **sort_sum_gradient**:

-        If framework will sum the gradient by the reverse order of trace. eg. x_var ( :ref:`api_guide_Variable` ) will be the input of multiple OP such as :ref:`api_fluid_layers_scale` , this attr will decide if framework will sum gradient of `x_var` by the reverse order.
+        If framework will sum gradients by the reverse order of the forward execution sequence. 
+        For instance, x_var ( :ref:`api_guide_Variable` ) will be the input of multiple OP such as :ref:`api_fluid_layers_scale` ,


"For instane, when/if x_var ( :ref:api_guide_Variable ) is the input of multiple OPs such as :ref:api_fluid_layers_scale, whether the framework sums the gradient of x_var by the reverse order is determined by this attr".

There are two grammar knowledges:

When we say conditional things, or things happen commonly, we don't use future tense. For example: "if x_var is XXX". no need to "if x_var will be XXX".

"this attr will decide XXX" is fine to me but I feel my writing is better.

Thanks. Done.

zhhsplendid · 2020-08-21T10:34:52Z

paddle/fluid/pybind/imperative.cc

+                # x_var will be multi-scales' input here
+                for _ in range(10):
+                    sums_inputs.append(paddle.scale(x_var))
+                ret2 = paddle.sums(sums_inputs)


Why is ret2, loss2 without ret1, loss1? Can we just write ret, loss?

zhhsplendid · 2020-08-21T10:36:18Z

python/paddle/fluid/dygraph/varbase_patch_methods.py

+            backward_strategy(BackwardStrategy, optional): The backward strategy to run the backward pass. If you would
+                like to sum gradients by the reverse order of the forward execution sequence, please set the value of
+                :code:`BackwardStrategy.sort_sum_gradient` to True. Refer to :ref:`api_fluid_dygraph_BackwardStrategy` for
+                more details. Defaults to None, which meant that the value of :code:`BackwardStrategy.sort_sum_gradient` is False.


"which meant" -> "which means"

zhhsplendid · 2020-08-21T10:37:17Z

python/paddle/fluid/dygraph/varbase_patch_methods.py

-                    backward_strategy = fluid.dygraph.BackwardStrategy()
-                    backward_strategy.sort_sum_gradient = True
-                    loss2.backward(backward_strategy)
+                inputs2 = []


Same to above comment, why trailing 2 at these variables.

zhhsplendid · 2020-08-21T10:38:06Z

python/paddle/fluid/framework.py

+            backward_strategy(BackwardStrategy, optional): The backward strategy to run the backward pass. If you would
+                like to sum gradients by the reverse order of the forward execution sequence, please set the value of
+                :code:`BackwardStrategy.sort_sum_gradient` to True. Refer to :ref:`api_fluid_dygraph_BackwardStrategy` for
+                more details. Defaults to None, which meant that the value of :code:`BackwardStrategy.sort_sum_gradient` is False.


"which meant" -> "which means"

zhhsplendid · 2020-08-21T10:38:25Z

python/paddle/fluid/framework.py

-                    backward_strategy = fluid.dygraph.BackwardStrategy()
-                    backward_strategy.sort_sum_gradient = True
-                    loss2.backward(backward_strategy)
+                inputs2 = []


Same to above comment, why trailing 2 at these variables.

swtkiwi · 2020-08-21T10:54:49Z

paddle/fluid/pybind/imperative.cc

-                    backward_strategy = fluid.dygraph.BackwardStrategy()
-                    backward_strategy.sort_sum_gradient = True
-                    loss2.backward(backward_strategy)
+                x_var = paddle.to_variable(x)


paddle.to_variable->paddle.to_tensor

swtkiwi · 2020-08-21T10:55:48Z

python/paddle/fluid/dygraph/varbase_patch_methods.py

@@ -134,38 +134,41 @@ def backward(self, backward_strategy=None, retain_graph=False):
        **Notes**:
            **This API is ONLY available in Dygraph mode**

-        Run backward of current Graph which starts from current Variable
+        Run backward of current Graph which starts from current Variable.



Variable->Tensor

swtkiwi · 2020-08-21T10:56:26Z

python/paddle/fluid/dygraph/varbase_patch_methods.py

-                    loss2.backward(backward_strategy)
+                inputs2 = []
+                for _ in range(10):
+                    tmp = paddle.to_variable(x)


paddle.to_variable->paddle.to_tensor

… fix_backward_doc

TCChenlong

LGTM

… fix_backward_doc

XiaoguangHu01

LGTM

TCChenlong

LGTM

raindrops2sea

LGTM

update the demo code and the doc of varbase.backward.

114071b

wzzju force-pushed the fix_backward_doc branch 2 times, most recently from 7a5e807 to 2990d29 Compare August 21, 2020 07:15

update the doc of the fake interface paddle.fluid.Variable.

06b996a

wzzju force-pushed the fix_backward_doc branch from 2990d29 to 06b996a Compare August 21, 2020 07:28

wzzju mentioned this pull request Aug 21, 2020

Update the demo code and the doc of varbase.backward. PaddlePaddle/docs#2448

Merged

zhhsplendid reviewed Aug 21, 2020

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swtkiwi reviewed Aug 21, 2020

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fix some grammar errors.

24d5230

wzzju force-pushed the fix_backward_doc branch from 821215c to 24d5230 Compare August 21, 2020 11:12

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into…

7e6e711

… fix_backward_doc

TCChenlong previously approved these changes Aug 21, 2020

View reviewed changes

wzzju added 2 commits August 26, 2020 17:14

remove BackwardStrategy.

9d42fc9

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into…

9cf12ba

… fix_backward_doc

wzzju dismissed TCChenlong’s stale review via 9cf12ba August 26, 2020 17:15

XiaoguangHu01 approved these changes Aug 27, 2020

View reviewed changes

phlrain self-requested a review August 27, 2020 03:44

TCChenlong approved these changes Aug 27, 2020

View reviewed changes

luotao1 approved these changes Aug 27, 2020

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raindrops2sea approved these changes Aug 27, 2020

View reviewed changes

wzzju merged commit f9066e6 into PaddlePaddle:develop Aug 27, 2020

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Update the demo code and the doc of varbase.backward. #26506

Update the demo code and the doc of varbase.backward. #26506

wzzju commented Aug 20, 2020 •

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Update the demo code and the doc of varbase.backward. #26506

Update the demo code and the doc of varbase.backward. #26506

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wzzju commented Aug 20, 2020 • edited Loading

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Variable.backward

paddle.grad

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wzzju commented Aug 20, 2020 •

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