【HETERPS】pipeline adaptive for heterps

[danleifeng]

PR types

New features

PR changes

Others

Describe

1. support pipeline training for heterps

• add begin_pass()
• remove build_gpu_ps()
• add finalize()
• add load_into_memory(is_shuffle=false)

2. fix exit bug
3. fix buildps hashtable core when pass ins_num = 0

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