[FIX] Extend time for test_activation_nn_grad to avoid its timeout issue (#36527)

* native commit for triple grad of sigmod

* Updated unittests files

* init functional jacobian api

* Updated trible_test func

* Updated gradient_checker & test_script

* finish test with dtype float32

* add float64 test case

* polish code

* use atol=1e-5 with dtype float64

* fix for ci

* set timeout for test_jacobian

* fix dygraph grad to support high differential

* polish API docstring

* Updated gradient checker and some related files

* fix double grad strip error for high differential

* fix double grad strip error for high differential

* Add Sigmoid triple grad tests

* fix dygraph double grad dtype error when calling for high differential senario

* Updated triple grad teses func

* Use np.random to initialize ddx

* Updated triple_grad_check func

* add todo for gradient checker and refine some comments

* remove additional code

* add test for warnging in backward.py

* add tanh triple grad

* format python code

* refine code

* make test_activation_nn_grad test time to 150s
Co-authored-by: Nveyron95 <veyron_wu@163.com>
Co-authored-by: Nlevi131 <limaolin01@baidu.com>

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -846,7 +846,7 @@ set_tests_properties(test_inplace_softmax_with_cross_entropy PROPERTIES TIMEOUT
 set_tests_properties(test_cross_entropy2_op PROPERTIES TIMEOUT 120)
 set_tests_properties(test_fetch_unmerged PROPERTIES TIMEOUT 120)
 set_tests_properties(test_gru_unit_op PROPERTIES TIMEOUT 120)
-set_tests_properties(test_activation_nn_grad PROPERTIES TIMEOUT 120)
+set_tests_properties(test_activation_nn_grad PROPERTIES TIMEOUT 150)
 set_tests_properties(test_empty_op PROPERTIES TIMEOUT 120)
 set_tests_properties(test_parallel_executor_transformer PROPERTIES TIMEOUT 120)
 set_tests_properties(test_elementwise_div_op PROPERTIES TIMEOUT 120)