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Part 1 of 2 - Making concrete math transformers (#255)
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core/src/main/scala/com/salesforce/op/stages/impl/feature/MathTransformers.scala
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| /* | ||
| * Copyright (c) 2017, Salesforce.com, Inc. | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions are met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright notice, this | ||
| * list of conditions and the following disclaimer. | ||
| * | ||
| * * Redistributions in binary form must reproduce the above copyright notice, | ||
| * this list of conditions and the following disclaimer in the documentation | ||
| * and/or other materials provided with the distribution. | ||
| * | ||
| * * Neither the name of the copyright holder nor the names of its | ||
| * contributors may be used to endorse or promote products derived from | ||
| * this software without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | ||
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
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| package com.salesforce.op.stages.impl.feature | ||
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| import com.salesforce.op.UID | ||
| import com.salesforce.op.features.types._ | ||
| import com.salesforce.op.stages.base.binary.BinaryTransformer | ||
| import com.salesforce.op.stages.base.unary.UnaryTransformer | ||
| import com.salesforce.op.utils.numeric.Number | ||
| import com.salesforce.op.utils.tuples.RichTuple._ | ||
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| import scala.reflect.runtime.universe.TypeTag | ||
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| /** | ||
| * Plus function truth table (Real as example): | ||
| * | ||
| * Real.empty + Real.empty = Real.empty | ||
| * Real.empty + Real(x) = Real(x) | ||
| * Real(x) + Real.empty = Real(x) | ||
| * Real(x) + Real(y) = Real(x + y) | ||
| */ | ||
| class AddTransformer[I1 <: OPNumeric[_], I2 <: OPNumeric[_]] | ||
| ( | ||
| uid: String = UID[AddTransformer[_, _]] | ||
| )( | ||
| implicit override val tti1: TypeTag[I1], | ||
| override val tti2: TypeTag[I2] | ||
| ) extends BinaryTransformer[I1, I2, Real](operationName = "plus", uid = uid){ | ||
| override def transformFn: (I1, I2) => Real = (i1: I1, i2: I2) => (i1.toDouble -> i2.toDouble).map(_ + _).toReal | ||
| } | ||
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| /** | ||
| * Scalar addition transformer | ||
| * | ||
| * @param scalar scalar value | ||
| * @param uid uid for instance | ||
| * @param tti type tag for input | ||
| * @param n value converter | ||
| * @tparam I input feature type | ||
| * @tparam N value type | ||
| */ | ||
| class ScalarAddTransformer[I <: OPNumeric[_], N] | ||
| ( | ||
| val scalar: N, | ||
| uid: String = UID[ScalarAddTransformer[_, _]] | ||
| )( | ||
| implicit override val tti: TypeTag[I], | ||
| val n: Numeric[N] | ||
| ) extends UnaryTransformer[I, Real](operationName = "plusS", uid = uid){ | ||
| override def transformFn: I => Real = (i: I) => i.toDouble.map(_ + n.toDouble(scalar)).toReal | ||
| } | ||
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| /** | ||
| * Minus function truth table (Real as example): | ||
| * | ||
| * Real.empty - Real.empty = Real.empty | ||
| * Real.empty - Real(x) = Real(-x) | ||
| * Real(x) - Real.empty = Real(x) | ||
| * Real(x) - Real(y) = Real(x - y) | ||
| */ | ||
| class SubtractTransformer[I1 <: OPNumeric[_], I2 <: OPNumeric[_]] | ||
| ( | ||
| uid: String = UID[SubtractTransformer[_, _]] | ||
| )( | ||
| implicit override val tti1: TypeTag[I1], | ||
| override val tti2: TypeTag[I2] | ||
| ) extends BinaryTransformer[I1, I2, Real](operationName = "minus", uid = uid){ | ||
| override def transformFn: (I1, I2) => Real = (i1: I1, i2: I2) => { | ||
| val optZ = (i1.toDouble, i2.toDouble) match { | ||
| case (Some(x), Some(y)) => Some(x - y) | ||
| case (Some(x), None) => Some(x) | ||
| case (None, Some(y)) => Some(-y) | ||
| case (None, None) => None | ||
| } | ||
| optZ.toReal | ||
| } | ||
| } | ||
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| /** | ||
| * Scalar subtract transformer | ||
| * | ||
| * @param scalar scalar value | ||
| * @param uid uid for instance | ||
| * @param tti type tag for input | ||
| * @param n value converter | ||
| * @tparam I input feature type | ||
| * @tparam N value type | ||
| */ | ||
| class ScalarSubtractTransformer[I <: OPNumeric[_], N] | ||
| ( | ||
| val scalar: N, | ||
| uid: String = UID[ScalarSubtractTransformer[_, _]] | ||
| )( | ||
| implicit override val tti: TypeTag[I], | ||
| val n: Numeric[N] | ||
| ) extends UnaryTransformer[I, Real](operationName = "minusS", uid = uid){ | ||
| override def transformFn: I => Real = (i: I) => i.toDouble.map(_ - n.toDouble(scalar)).toReal | ||
| } | ||
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| /** | ||
| * Multiply function truth table (Real as example): | ||
| * | ||
| * Real.empty * Real.empty = Real.empty | ||
| * Real.empty * Real(x) = Real.empty | ||
| * Real(x) * Real.empty = Real.empty | ||
| * Real(x) * Real(y) = Real(x * y) filter ("is not NaN or Infinity") | ||
| */ | ||
| class MultiplyTransformer[I1 <: OPNumeric[_], I2 <: OPNumeric[_]] | ||
| ( | ||
| uid: String = UID[MultiplyTransformer[_, _]] | ||
| )( | ||
| implicit override val tti1: TypeTag[I1], | ||
| override val tti2: TypeTag[I2] | ||
| ) extends BinaryTransformer[I1, I2, Real](operationName = "multiply", uid = uid){ | ||
| override def transformFn: (I1, I2) => Real = (i1: I1, i2: I2) => { | ||
| val result = for { | ||
| x <- i1.toDouble | ||
| y <- i2.toDouble | ||
| } yield x * y | ||
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| result filter Number.isValid toReal | ||
| } | ||
| } | ||
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| /** | ||
| * Scalar multiply transformer | ||
| * | ||
| * @param scalar scalar value | ||
| * @param uid uid for instance | ||
| * @param tti type tag for input | ||
| * @param n value converter | ||
| * @tparam I input feature type | ||
| * @tparam N value type | ||
| */ | ||
| class ScalarMultiplyTransformer[I <: OPNumeric[_], N] | ||
| ( | ||
| val scalar: N, | ||
| uid: String = UID[ScalarMultiplyTransformer[_, _]] | ||
| )( | ||
| implicit override val tti: TypeTag[I], | ||
| val n: Numeric[N] | ||
| ) extends UnaryTransformer[I, Real](operationName = "multiplyS", uid = uid){ | ||
| override def transformFn: I => Real = (i: I) => i.toDouble.map(_ * n.toDouble(scalar)).filter(Number.isValid).toReal | ||
| } | ||
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| /** | ||
| * Divide function truth table (Real as example): | ||
| * | ||
| * Real.empty / Real.empty = Real.empty | ||
| * Real.empty / Real(x) = Real.empty | ||
| * Real(x) / Real.empty = Real.empty | ||
| * Real(x) / Real(y) = Real(x * y) filter ("is not NaN or Infinity") | ||
| */ | ||
| class DivideTransformer[I1 <: OPNumeric[_], I2 <: OPNumeric[_]] | ||
| ( | ||
| uid: String = UID[MultiplyTransformer[_, _]] | ||
| )( | ||
| implicit override val tti1: TypeTag[I1], | ||
| override val tti2: TypeTag[I2] | ||
| ) extends BinaryTransformer[I1, I2, Real](operationName = "divide", uid = uid){ | ||
| override def transformFn: (I1, I2) => Real = (i1: I1, i2: I2) => { | ||
| val result = for { | ||
| x <- i1.toDouble | ||
| y <- i2.toDouble | ||
| } yield x / y | ||
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| result filter Number.isValid toReal | ||
| } | ||
| } | ||
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| /** | ||
| * Scalar divide transformer | ||
| * | ||
| * @param scalar scalar value | ||
| * @param uid uid for instance | ||
| * @param tti type tag for input | ||
| * @param n value converter | ||
| * @tparam I input feature type | ||
| * @tparam N value type | ||
| */ | ||
| class ScalarDivideTransformer[I <: OPNumeric[_], N] | ||
| ( | ||
| val scalar: N, | ||
| uid: String = UID[ScalarDivideTransformer[_, _]] | ||
| )( | ||
| implicit override val tti: TypeTag[I], | ||
| val n: Numeric[N] | ||
| ) extends UnaryTransformer[I, Real](operationName = "divideS", uid = uid){ | ||
| override def transformFn: I => Real = (i: I) => i.toDouble.map(_ / n.toDouble(scalar)).filter(Number.isValid).toReal | ||
| } | ||
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