* add sumary feature

* refine printting tensor

* add sci_mode

* add sample code

* fix indent error

* fix _format_item

* polish code

* support item indent

* add ut

* set place for ut

* fix py2 issue

* fix ut

* update index sample

* 1. remove paddle.unique_with_counts api, which counts as unique api
2. add paddle.math.increment(x, value=1.0, name=None) api
3. replace paddle.sums with paddle.add_n api
4. update paddle.metric.accuracy api (add name parameter)

Update code examples for api2.0 

* refine parameters order && doc

* update rmsprop doc

* refine adam/transpose/unstack/stride_slice

* fix bug && doc

* fix doc

* bug fix

* bug fix

* fix doc

* fix doc

* fix doc

* fix doc

* depercate old strided_slice

* update doc

* set default value for name

* update doc

Mutiply allows non-tensor data input

Fix cross, cumsum op docs

* test=develop, update example

* fix the scatternd/scatterndadd

* fix the doc of scatter

* replace rank with ndim

* add multinomial cpu kernel

* fix C++ notype error

* fix windows ci array len error

* let array len be const

* change array to vector

* add cuda kernrl with num_distribution is 1, and not support replacement=False

* add multinomial python api

* support num_distribution different multinomial distributions

* add multinomial python api unittest

* change output dtype to int64

* fix coverage prob

* optimize format

* fix dtype of output error, should be int64_t

* remove inplace argument

* fix sample code

* fix sample code

* add fp16 for matmul

* init commit of new save/load

* fix failed unittests

* fix save_load_v2 unittest failed

* fix failed unittest & polish doc

* add tests for coverage

* add more tests & move static apis

* fix example code error

* polish emample code

* fix detail example code problem

* Makes the Bind Method more intelligent

* Makes the Bind Method more intelligent

* fix unittest

* fix unittest

* fix conflict

* remove paddle.readers API. test=develop

and optimize the c++ implmentation of empty op as PR#26659 reviews,
and add bool for shape op.

* bug fix, test=develop

* temporally disable zero_copy

* add test

* follow comments

* fix frobenius_norm error, rm p=0 2-axis support. test=develop

* fix unsqueeze in dygraph

* add test

* add test

fix the bug for dtype check for the argmin/argmax

update the check for the dtype check for the argmin, argmax

update doc of paddle.to_tensor

* fix unittest format and extract common function

* change function name