Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/15148#discussion_r82536925
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/LSH.scala ---
@@ -0,0 +1,339 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.ml.feature
+
+import scala.util.Random
+
+import org.apache.spark.annotation.{Experimental, Since}
+import org.apache.spark.ml.{Estimator, Model}
+import org.apache.spark.ml.linalg.{Vector, VectorUDT}
+import org.apache.spark.ml.param.{IntParam, ParamMap, ParamValidators}
+import org.apache.spark.ml.param.shared.{HasInputCol, HasOutputCol}
+import org.apache.spark.ml.util.SchemaUtils
+import org.apache.spark.sql._
+import org.apache.spark.sql.expressions.UserDefinedFunction
+import org.apache.spark.sql.functions._
+import org.apache.spark.sql.types._
+
+/**
+ * Params for [[LSH]].
+ */
+@Experimental
+@Since("2.1.0")
+private[ml] trait LSHParams extends HasInputCol with HasOutputCol {
+ /**
+ * Param for the dimension of LSH OR-amplification.
+ *
+ * In this implementation, we use LSH OR-amplification to reduce the
false negative rate. The
+ * higher the dimension is, the lower the false negative rate.
+ * @group param
+ */
+ @Since("2.1.0")
+ final val outputDim: IntParam = new IntParam(this, "outputDim", "output
dimension, where" +
+ "increasing dimensionality lowers the false negative rate, and
decreasing dimensionality" +
--- End diff --
Does increasing dimensionality lower the false negative rate?
I think increasing dimensionality should lower false positive rate, right?
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