* feat(Optim): add sgd

* fix(*): add no_grad guard in optimizer

* fix(*): fix bug in optimizer test

* style(*): format codes

* style(Optimizer): refine codes

* style(Optimizer): refine codes

* fix(Optimizer): fix bug in ParamGroup

* fix(*): add __init__.py

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* Accumulate partial grad to acc tensor promptly.

* refactor(Tensor): add AutogradMeta and delete retain_grad in constructor

* refactor(AutogradEngine): function node just cache autograd_meta and
                          output tensor_infos

* fix(*): fix bugs and add zeros op

* Capture detached output tensors.

* fix(*): fix merge bugs

* style(*): refine code

* fix(*): refine FunctionNode release

* fix(Autograd): save input tensors which requires_grad is true

* fix(*): fix bug

* format code

* chore(*): add head file in cmake

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* fix crossentropy_loss bug

* fix comment

* fix comment

* format test_crossentropyloss.py

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* add negative and nllloss module

* add negative and nllloss module

* add negative and nllloss module

* add negative and nllloss module

* add nllloss impleted, relay on other module, do not merge now

* fix nllloss bug

* support 2d nllloss bug

* fix comment

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* support bert nllloss

* fix nllloss 2d bug

* add docs

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* Serialize proto in binary rather than text

* refine

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* add python interface

* minor fix

* change name

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* ArgTuple

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* add GetRank and GetWordSize interface

* minor fix

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* Fw/Bw support double compute stream

* NCCL comm create by stream id

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* StreamIndex: NcclComputeStream for each subgraph insert nccl logical.

* refactor code

* refine code for review

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* fix complier err

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* fix bug and runnable

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* Pipeline buffer pass

* Pipeline runnable

* rollback NOT merge mem chain hack

* pipeline_stage_id_hint and rollback checkpointing buffer

* Pipeline buffer only. test pass.

* rollback repeat hack

* Remove CopyHd Hack; Add buffer cross label loader and loss

* InsertNcclLogicalOps support multi-subgraph by placement group

* Implement of InsertNcclLogicalOpPass support multi-subgraph and batch acc and pipeline parallel

* Pipeline + 2D-SBP runnable

* remote note

* WARNING to INFO

* refine code for review & fix for new dtype infer

* add note

* Hotfix ib qp max_send_wr

* Pipeline Debug: hack copy hd/commnet regst num to 2 and increase buffer regst num +1

* add buffer op for copyD2H pipe

* fix bug of insert buffer in backward pass stages

* rollback buffer hack

* buffer size = total stage num

* Hack buffer size of loader data/label

* Double buffer

* fix bug of check

* hack buffer size

* Fix buffer connected bug. and refine buffer size

* collection reserve for saving rehash cost

* refine code and note

* set dst buffer size to max

* refine dst buffer size

* Refine Backward buffer size

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* dont use import to determine if export onnx

* fix

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* Pipeline Parallelism: checkpointing insert identity buffer op

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* Pipeline buffer pass

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* pipeline_stage_id_hint and rollback checkpointing buffer

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* rollback repeat hack

* Remove CopyHd Hack; Add buffer cross label loader and loss

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* Implement of InsertNcclLogicalOpPass support multi-subgraph and batch acc and pipeline parallel

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* WARNING to INFO

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* add 163 centos mirror

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* add logsoftmax module

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* refine

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* add modules:

- sum
- mean
- add
- sub
- mul
- div
- reciprocal

* add +, -, *, / for tensor

* add test case for add,div,mean,mul,reciprocal,sub,sum

* refine test cases

* refine sum module

* remove useless oneflow_export for mean and sum

* add tensor op test for mean and sum

* add CrossEntropyLoss module

* refine Sum

* sum axis attr not found

* refine sum

* refine math ops

* refien cross entropy loss

* refine (not finished)

* fix scalar div, sub

* rename test Module name and refine test case

* rename test Module name and refine test case

* add neg method for Tensor

* remove useless improt items

* refine

* reformat

* remove useless dynamic attr

* fix math_ops and loss

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* style(*): format codes

* fix(MathOp): fix merge bug

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* add exp_tanh_gelu module

* fix comment

* fix comment

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* add conv2d module

* support bias

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* format

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This reverts commit 32e439ba.

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* add concat_matmul module

* add concat_matmul module

* fix comment

* fix comment

* fix comment

* fix comment

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* Pipeline Parallelism: checkpointing insert identity buffer op

* fix complier err

* identity buffer op custom out regst num

* fix bug and runnable

* Chain merge divide fw/bw; MemChain ignore merge; copyhd regst num hack

* Pipeline buffer pass

* Pipeline runnable

* rollback NOT merge mem chain hack

* pipeline_stage_id_hint and rollback checkpointing buffer

* Pipeline buffer only. test pass.

* rollback repeat hack

* Remove CopyHd Hack; Add buffer cross label loader and loss

* refine code for review & fix for new dtype infer

* add note

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* add tmp.rst

* fix bug

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* fix typo

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* Return index for SaveTensorForBackward.

* Fix layer_norm gradient function.

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* add reshape_expand_repeat module

* fix comment

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* add relu module and test case

* add maxpool2d module and test case

* update according to pr4746

* add batchnorm module

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* refine according to reviewer's comment

* refine batchnorm test case

* fix asserttation

* refine

* add maxpool2d testcase

* update date of license

* add constant modules

* refine

* add sin cos log module

* add more test cases

* add maxpool2d test case

* refine

* fix tmp_buffer

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* refine constant module

* refine according to comments

* fix according comments

* recover license date

* remove todo item

* remove useless codes

* remove useless import

* refine

* update constant modules

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* refine docs

* remove device param

* add test case

* update pooling test case

* add batchnorm eval test

* refine according to comments

* rename var and remove useless codes

* refine batchnorm test case

* refine according to comments

* Update stateful_local_opkernel.cpp

* fix pooling module

* fix according to comments

* refine

* refine

* refine param

* refine api docs

* flake format

* format

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* Refactor

* Draft

* Refactor

* Add MutableCfgAttrValueMap

* implement AttrValueMap and ComposedAttrValueMap (#4767)

* Attr value util (#4773)

* implement AttrValueMap and ComposedAttrValueMap

* AttrValueUtil::ToProtoAttrValue

* Fix compile

* Fix compilation

* Rename AttrValueMap by AttrMap.

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* move default log under log dir

* remove default env log from proto

* refine

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* NcclLogialOpAllGatherNoncontinuous S1 to B

* delete useless file

* fix user op attr err

* fix tmp_buffer

* Update oneflow/user/kernels/nccl_logical_kernels.cpp

* fix data size check in 2d s1-b

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* add flatten module and unit test

* add changes according to review

* fix docs

* use nn.init

* add modification according to review

* remove useless code

* add more tests & fix doc

* fix default parameters for module and function

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