StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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119 lines
3.1 KiB
119 lines
3.1 KiB
/**
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* Implementation detail
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*/
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function Node(handler) {
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this.description = handler.description || "unnamed";
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this.incoming = handler.incoming || function (ctx, event) { ctx.sendNext(event) };
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this.outgoing = handler.outgoing || function (ctx, event) { ctx.sendNext(event) };
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this.next = null;
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this.prev = null;
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}
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/**
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* Implementation of the Pipeline class
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* Pipeline is a bi-directional, ordered chain of functions. Each function in the pipeline
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* communicates with the next function through an interface provided by the pipeline.
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*
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* Functions inside the pipeline need to accept events and context objects. Context objects provide a
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* way to communicate with the next or previous functions and access to pipe-level global variables.
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*
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* 'Pipeline' is inspired by pipelines of Java's netty and grizzly projects. It implements a
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* bi-directional 'intercepting-filter.'
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*
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* The implementation of based on a linked-list.
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*/
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function Pipeline(stream) {
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var self = this;
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this.first = null;
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this.last = null;
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this.state = {};
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this.addHandler = function (handler) {
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var node = new Node(handler);
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if (self.first === null) {
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self.first = node;
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self.last = node;
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node.next = null;
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}
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else {
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self.last.next = node;
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node.prev = self.last;
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self.last = node;
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node.next = null;
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}
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};
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this.pushIncoming = function (evt) {
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self.first.incoming(makeCtx(self.first, stream, true, self.state), evt);
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};
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this.pushOutgoing = function (evt) {
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self.last.outgoing(makeCtx(self.last, stream, false, self.state), evt);
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};
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this.pushIncomingData = function (data) {
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self.first.incoming(makeCtx(self.first, stream, true, self.state), {
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eventType: "data",
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data: data
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});
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};
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this.pushOutgoingData = function (data) {
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self.last.outgoing(makeCtx(self.last, stream, false, self.state), {
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eventType: "data",
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data: data
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});
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};
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this.toString = function () {
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var nodes = [];
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var node = self.first;
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while (node !== null) {
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nodes.push(node.description);
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node = node.next;
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}
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return nodes.join(","); //TODO add 'state' object to the output as well
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};
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}
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function makeCtx(node, stream, isIncoming, stateobj) {
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var incomingCtx = function (evt) {
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if (node.next !== null) {
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node.next.incoming(makeCtx(node.next, stream, true, stateobj), evt);
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}
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};
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var outgoingCtx = function (evt) {
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if (node.prev != null) {
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node.prev.outgoing(makeCtx(node.prev, stream, false, stateobj), evt);
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}
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};
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if (isIncoming) {
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return {
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sendNext: incomingCtx,
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sendPrev: outgoingCtx,
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stream: stream,
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state: stateobj
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};
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}
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else {
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return {
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sendNext: outgoingCtx,
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sendPrev: incomingCtx,
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stream: stream,
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state: stateobj
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};
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}
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}
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exports.makePipe = function (stream) {
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return new Pipeline(stream);
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}
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