Github user Yunni commented on a diff in the pull request:
https://github.com/apache/spark/pull/15874#discussion_r89175497
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/MinHashLSH.scala
---
@@ -31,36 +31,38 @@ import org.apache.spark.sql.types.StructType
/**
* :: Experimental ::
*
- * Model produced by [[MinHash]], where multiple hash functions are
stored. Each hash function is
- * a perfect hash function:
- * `h_i(x) = (x * k_i mod prime) mod numEntries`
- * where `k_i` is the i-th coefficient, and both `x` and `k_i` are from
`Z_prime^*`
+ * Model produced by [[MinHashLSH]], where multiple hash functions are
stored. Each hash function is
+ * picked from a hash family for a specific set `S` with cardinality equal
to `numEntries`:
+ * `h_i(x) = ((x \cdot a_i + b_i) \mod prime) \mod numEntries`
--- End diff --
Fixed
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