tensorflow-gpu版本from1.14.0 to 1.15.2修改可能引起的不兼容问题

[jamery-huang]

应该是gast、tensorboard、tensorflow-estimator的版本没有同步修改

cmd：pip install -r requirements.txt
Log：
ERROR: tensorflow-gpu 1.15.2 has requirement gast==0.2.2, but you'll have gast 0.3.3 which is incompatible.
ERROR: tensorflow-gpu 1.15.2 has requirement tensorboard<1.16.0,>=1.15.0, but you'll have tensorboard 1.14.0 which is incompatible.
ERROR: tensorflow-gpu 1.15.2 has requirement tensorflow-estimator==1.15.1, but you'll have tensorflow-estimator 1.14.0 which is incompatible.

[alimai]

多装几次错误会跳过,貌似也不影响计算