mingo/cjs/operators/window/minMaxScaler.js

MongoDB query language for in-memory objects

var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var minMaxScaler_exports = {};
__export(minMaxScaler_exports, {
  $minMaxScaler: () => $minMaxScaler
});
module.exports = __toCommonJS(minMaxScaler_exports);
var import_util = require("../../util");
var import_push = require("../accumulator/push");
var import_internal = require("./_internal");
const $minMaxScaler = (_, collection, expr, options) => {
  return (0, import_internal.withMemo)(
    collection,
    expr,
    () => {
      const args = expr.inputExpr;
      const min = args.min || 0;
      const max = args.max || 1;
      const nums = (0, import_push.$push)(
        collection,
        args.input || expr.inputExpr,
        options
      );
      (0, import_util.assert)(
        (0, import_util.isArray)(nums) && nums.length > 0 && nums.every(import_util.isNumber),
        "$minMaxScaler: input must be a numeric array"
      );
      let rmin = nums[0];
      let rmax = nums[0];
      for (const n of nums) {
        if (n < rmin) rmin = n;
        else if (n > rmax) rmax = n;
      }
      const scale = max - min;
      const range = rmax - rmin;
      (0, import_util.assert)(range !== 0, "$minMaxScaler: input range must not be zero");
      return {
        min,
        scale,
        rmin,
        range,
        nums
      };
    },
    (data) => {
      const { min, rmin, scale, range, nums } = data;
      return (nums[expr.documentNumber - 1] - rmin) / range * scale + min;
    }
  );
};
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  $minMaxScaler
});