remove Free() method in UnmanagedAllocator

add fused broadcast op unit test

It seems that the blocking queue might be destroyed early than Run
method complete. It might because the Run method throw some unhandled
exception. However, it should be shared_ptr when multthread access an
resource. So change BlockingQueue as a shared_ptr.

test=develop

fix sequence_pad example error

* fix use_reader_alloc uts

* dist ut fixes test=develop

* update test=develop

* fix test for py3 test=develop

test=develop

remove the optimized but buggy implementation

test=develop

Fix dynamic_gru h_0 bug

Fix Mac Python3 CI job

Max Sequence pool optimization

remove with_inference option

test=develop

test=develop

* feat(platform): lazy initialization of devicecontext in pool

Use std::async(deferer, []{...}) to lazy initialize DeviceContext in Pool

test=develop

* Add future includes

test=develop

test=develop

test=develop

increase test timeout coverage.

1.add position encoding  2.logloss in nn.py

test=develop

test=develop

test=develop

Fix inference model not found on Mac CI

* fix sum_op's GetExpectedKernelType
test=develop

* fix ci fail
test=develop

test=develop

test=develop

test=develop

generate proposal labels doc

Refine/jit/crf decoding

Fix import plot in py3

disable some tests

[1.1] fix cmake warning when ON_INFER=false