diff options
| -rw-r--r-- | mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala index 328dbe2ce1..4ef171f4f0 100644 --- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala +++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/Vectors.scala @@ -227,7 +227,7 @@ object Vectors { * @param elements vector elements in (index, value) pairs. */ def sparse(size: Int, elements: Seq[(Int, Double)]): Vector = { - require(size > 0) + require(size > 0, "The size of the requested sparse vector must be greater than 0.") val (indices, values) = elements.sortBy(_._1).unzip var prev = -1 @@ -235,7 +235,8 @@ object Vectors { require(prev < i, s"Found duplicate indices: $i.") prev = i } - require(prev < size) + require(prev < size, s"You may not write an element to index $prev because the declared " + + s"size of your vector is $size") new SparseVector(size, indices.toArray, values.toArray) } @@ -309,7 +310,8 @@ object Vectors { * @return norm in L^p^ space. */ def norm(vector: Vector, p: Double): Double = { - require(p >= 1.0) + require(p >= 1.0, "To compute the p-norm of the vector, we require that you specify a p>=1. " + + s"You specified p=$p.") val values = vector match { case DenseVector(vs) => vs case SparseVector(n, ids, vs) => vs @@ -360,7 +362,8 @@ object Vectors { * @return squared distance between two Vectors. */ def sqdist(v1: Vector, v2: Vector): Double = { - require(v1.size == v2.size, "vector dimension mismatch") + require(v1.size == v2.size, s"Vector dimensions do not match: Dim(v1)=${v1.size} and Dim(v2)" + + s"=${v2.size}.") var squaredDistance = 0.0 (v1, v2) match { case (v1: SparseVector, v2: SparseVector) => @@ -518,7 +521,9 @@ class SparseVector( val indices: Array[Int], val values: Array[Double]) extends Vector { - require(indices.length == values.length) + require(indices.length == values.length, "Sparse vectors require that the dimension of the" + + s" indices match the dimension of the values. You provided ${indices.size} indices and " + + s" ${values.size} values.") override def toString: String = "(%s,%s,%s)".format(size, indices.mkString("[", ",", "]"), values.mkString("[", ",", "]")) |