From: @kisnwang
Reviewed-by: 
Signed-off-by:

From: @liubuyu
Reviewed-by: @kisnwang,@zhoufeng54
Signed-off-by: @zhoufeng54

From: @jojobugfree
Reviewed-by: @kisnwang,@zhoufeng54,@chujinjin
Signed-off-by: @chujinjin

sparse loss

format

add string head

context

what's more:
  remove one restriction of getitem in ops fusion.
  add a while loop for the ShapeOpsSplitter pass.
  add ExpandDims into shape_ops list.

From: @looop5
Reviewed-by: @lingyunli63,@ckey_dou,@gaoxiong1
Signed-off-by: @ckey_dou

From: @simson_wu
Reviewed-by: @chujinjin
Signed-off-by: @chujinjin

From: @liujunzhu
Reviewed-by: @kisnwang,@zhoufeng54
Signed-off-by: @zhoufeng54

From: @ythuang
Reviewed-by: 
Signed-off-by:

From: @kisnwang
Reviewed-by: 
Signed-off-by:

From: @liangzelang
Reviewed-by: @zhoufeng54,@kisnwang
Signed-off-by: @kisnwang

From: @liangzelang
Reviewed-by: 
Signed-off-by:

From: @kisnwang
Reviewed-by: 
Signed-off-by:

From: @lianliguang
Reviewed-by: @chujinjin,@kisnwang
Signed-off-by: @chujinjin

fixbug in ReplaceNewFuseCNode
add a pass to eliminate repeated output after cse
fixbug in graph_kernel_splitter
do not fuse reshape op as output in costmodel.

From: @wilfchen
Reviewed-by: @cristoval,@limingqi107
Signed-off-by: @cristoval

From: @liu_xiao_93
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @limingqi107
Reviewed-by: @cristoval,@kisnwang
Signed-off-by: @cristoval

From: @jiangzg001
Reviewed-by: @kingxian,@c_34,@kingxian
Signed-off-by: @c_34

From: @limingqi107
Reviewed-by: @kisnwang
Signed-off-by:

check input dims for nn.LSTM.

From: @yuchaojie
Reviewed-by: @kisnwang,@zhoufeng54
Signed-off-by: @zhoufeng54

From: @liubuyu
Reviewed-by: 
Signed-off-by: