Created by: chenwhql

as title.

skip paddle.fluid.core in API.spec to skip comparing paddle.fluid.core.***

[09:16:19]	[Step 1/1] + python sampcd_processor.py cpu
[09:16:21]	[Step 1/1] API check -- Example Code
[09:16:21]	[Step 1/1] ('sample_test running under python', '2.7.15')
[09:16:21]	[Step 1/1] 
[09:16:21]	[Step 1/1] ----Exception in get api methods----
[09:16:21]	[Step 1/1] 
[09:16:21]	[Step 1/1] 
[09:16:21]	[Step 1/1] paddle.fluid.core_avx.ops.dist
[09:16:21]	[Step 1/1] 
[09:16:21]	[Step 1/1] 
[09:16:21]	[Step 1/1] 
[09:16:21]	[Step 1/1] paddle.fluid.core_avx.ops.dist method is None!!!
[09:16:21]	[Step 1/1] 
[09:16:21]	[Step 1/1] API_PR is diff from API_DEV: ['../python/paddle/tensor/linalg.py', '../python/paddle/fluid/core_avx/ops.py']