The reason for adding the function is exemplified in the following hypothetical code:

mem = memory(name=None, size=256)
hidden = fc_layer(input=mem)
state = hidden + x
mem.set_input(state)

In the above code segment, it would be very annoying if we require the user to provide
the name at memory() call because the layer name of state is automatically generated
and is not easy to set it.

Change-Id: I918bf1d3d5c26addd88a6f7021e98b3e0e9df494

Temporary disable async load data in PyDP2.

New API Design Doc

Add std for setiosflags

* It seems some other change breaks the async load. It will cause data
  error in GPU mode.

Cosine Similarity Paddle Function.

rewrite unit test for Context Projection

Fix mkDirRecursively

Change-Id: Ie09fd666ca208994f22e9f83af6072f4d5e6aa1a

remove usused arguments for maxout_layer, refine notes for pad_layer

Rename Python function DataBase into create_data_config_proto

This reverts commit ab279bee.