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由 Xiangrui Meng 提交于
to avoid overflow in `exp(x)` if `x` is large. Author: Xiangrui Meng <meng@databricks.com> Closes #1493 from mengxr/py-logistic and squashes the following commits: 259e863 [Xiangrui Meng] stabilize logistic function in pyspark
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