Implement --sum-surplus-transfers
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7234E476BF21C61A
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@ -151,6 +151,12 @@ dependencies = [
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"syn",
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]
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[[package]]
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name = "either"
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version = "1.6.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
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[[package]]
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name = "flate2"
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version = "1.0.20"
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@ -233,6 +239,15 @@ dependencies = [
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"hashbrown",
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]
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[[package]]
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name = "itertools"
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version = "0.10.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "69ddb889f9d0d08a67338271fa9b62996bc788c7796a5c18cf057420aaed5eaf"
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dependencies = [
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"either",
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]
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[[package]]
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name = "itoa"
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version = "0.4.7"
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@ -338,6 +353,7 @@ dependencies = [
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"flate2",
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"git-version",
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"ibig",
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"itertools",
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"js-sys",
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"num-bigint",
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"num-rational",
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@ -11,6 +11,7 @@ crate-type = ["lib", "cdylib"]
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derive_more = "0.99.14"
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git-version = "0.3.4"
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ibig = "0.3.2"
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itertools = "0.10.1"
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num-traits = "0.2"
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wasm-bindgen = "0.2.74"
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@ -35,7 +35,8 @@
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<label>
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Preset:
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<select id="selPreset" onchange="changePreset()">
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<option value="scottish" selected>Scottish STV</option>
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<option value="wigm" selected>Recommended WIGM</option>
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<option value="scottish">Scottish STV</option>
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<option value="senate">Australian Senate STV</option>
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<!--<option value="meek">Meek STV</option>
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<option value="wright">Wright STV</option>-->
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@ -58,14 +59,14 @@
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<label>
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Quota:
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<select id="selQuotaCriterion">
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<option value="geq" selected>>=</option>
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<option value="gt">></option>
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<option value="geq">≥</option>
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<option value="gt" selected>></option>
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</select>
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</label>
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<label>
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<select id="selQuota">
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<option value="droop" selected>Droop</option>
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<option value="droop_exact">Droop (exact)</option>
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<option value="droop">Droop</option>
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<option value="droop_exact" selected>Droop (exact)</option>
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<option value="hare">Hare</option>
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<option value="hare_exact">Hare (exact)</option>
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</select>
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@ -146,8 +147,8 @@
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<label>
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Numbers:
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<select id="selNumbers">
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<option value="rational">Rational</option>
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<option value="fixed" selected>Fixed</option>
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<option value="rational" selected>Rational</option>
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<option value="fixed">Fixed</option>
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<!--<option value="gfixed">Fixed (guarded)</option>-->
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<option value="float64">Float (64-bit)</option>
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</select>
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@ -184,7 +185,7 @@
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</div>
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<div class="col-6">
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<label>
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<input type="checkbox" id="chkRoundQuota" checked>
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<input type="checkbox" id="chkRoundQuota">
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Quota:
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</label>
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<label>
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@ -205,7 +206,7 @@
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<div class="col-6">
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<label>
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<input type="checkbox" id="chkRoundTVs">
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Transfer values:
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Surplus fractions:
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</label>
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<label>
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<input type="number" id="txtRoundTVs" value="0" min="0" style="width: 3em;">
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@ -222,6 +223,14 @@
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d.p.
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</label>
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</div>
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<label class="col-12">
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Sum surplus transfers:
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<select id="selSumTransfers">
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<option value="single_step" selected>Single step</option>
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<option value="by_value">By value</option>
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<option value="per_ballot">Per ballot</option>
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</select>
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</label>
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</div>
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</div>
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@ -95,6 +95,7 @@ async function clickCount() {
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document.getElementById('chkRoundWeights').checked ? parseInt(document.getElementById('txtRoundWeights').value) : null,
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document.getElementById('chkRoundVotes').checked ? parseInt(document.getElementById('txtRoundVotes').value) : null,
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document.getElementById('chkRoundQuota').checked ? parseInt(document.getElementById('txtRoundQuota').value) : null,
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document.getElementById('selSumTransfers').value,
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document.getElementById('selQuota').value,
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document.getElementById('selQuotaCriterion').value,
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document.getElementById('selQuotaMode').value,
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@ -291,7 +292,26 @@ async function printResult() {
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// Presets
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function changePreset() {
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if (document.getElementById('selPreset').value === 'scottish') {
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if (document.getElementById('selPreset').value === 'wigm') {
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document.getElementById('selQuotaCriterion').value = 'gt';
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document.getElementById('selQuota').value = 'droop_exact';
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document.getElementById('selQuotaMode').value = 'static';
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document.getElementById('chkBulkElection').checked = true;
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document.getElementById('chkBulkExclusion').checked = false;
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document.getElementById('chkDeferSurpluses').checked = false;
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document.getElementById('selNumbers').value = 'rational';
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document.getElementById('txtPPDP').value = '2';
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document.getElementById('chkRoundQuota').checked = false;
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document.getElementById('chkRoundVotes').checked = false;
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document.getElementById('chkRoundTVs').checked = false;
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document.getElementById('chkRoundWeights').checked = false;
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document.getElementById('selSumTransfers').value = 'single_step';
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document.getElementById('selSurplus').value = 'by_size';
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document.getElementById('selTransfers').value = 'wig';
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document.getElementById('selPapers').value = 'both';
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document.getElementById('selExclusion').value = 'single_stage';
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//document.getElementById('selTies').value = 'backwards_random';
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} else if (document.getElementById('selPreset').value === 'scottish') {
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document.getElementById('selQuotaCriterion').value = 'geq';
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document.getElementById('selQuota').value = 'droop';
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document.getElementById('selQuotaMode').value = 'static';
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@ -300,12 +320,14 @@ function changePreset() {
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document.getElementById('chkDeferSurpluses').checked = false;
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document.getElementById('selNumbers').value = 'fixed';
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document.getElementById('txtDP').value = '5';
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document.getElementById('txtPPDP').value = '2';
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document.getElementById('txtPPDP').value = '5';
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document.getElementById('chkRoundQuota').checked = true;
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document.getElementById('txtRoundQuota').value = '0';
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document.getElementById('chkRoundVotes').checked = false;
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document.getElementById('chkRoundTVs').checked = false;
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document.getElementById('chkRoundTVs').checked = true;
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document.getElementById('txtRoundTVs').value = '5';
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document.getElementById('chkRoundWeights').checked = false;
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document.getElementById('selSumTransfers').value = 'per_ballot';
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document.getElementById('selSurplus').value = 'by_size';
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document.getElementById('selTransfers').value = 'wig';
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document.getElementById('selPapers').value = 'both';
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@ -327,6 +349,7 @@ function changePreset() {
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document.getElementById('txtRoundVotes').value = '0';
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document.getElementById('chkRoundTVs').checked = false;
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document.getElementById('chkRoundWeights').checked = false;
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document.getElementById('selSumTransfers').value = 'single_step';
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document.getElementById('selSurplus').value = 'by_order';
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document.getElementById('selTransfers').value = 'uig';
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document.getElementById('selPapers').value = 'both';
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@ -350,6 +373,7 @@ function changePreset() {
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document.getElementById('txtRoundTVs').value = '3';
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document.getElementById('chkRoundWeights').checked = true;
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document.getElementById('txtRoundWeights').value = '3';
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document.getElementById('selSumTransfers').value = 'single_step';
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document.getElementById('selSurplus').value = 'by_order';
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document.getElementById('selTransfers').value = 'eg';
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document.getElementById('selPapers').value = 'transferable';
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@ -373,6 +397,7 @@ function changePreset() {
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document.getElementById('txtRoundTVs').value = '2';
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document.getElementById('chkRoundWeights').checked = true;
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document.getElementById('txtRoundWeights').value = '2';
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document.getElementById('selSumTransfers').value = 'single_step';
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document.getElementById('selSurplus').value = 'by_size';
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document.getElementById('selTransfers').value = 'eg';
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document.getElementById('selPapers').value = 'transferable';
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@ -78,6 +78,9 @@ struct STV {
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#[clap(help_heading=Some("ROUNDING"), long, value_name="dps")]
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round_quota: Option<usize>,
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#[clap(help_heading=Some("ROUNDING"), long, possible_values=&["single_step", "by_value", "per_ballot"], default_value="single_step", value_name="mode")]
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sum_surplus_transfers: String,
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// -----------
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// -- Quota --
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@ -173,6 +176,7 @@ where
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cmd_opts.round_weights,
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cmd_opts.round_votes,
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cmd_opts.round_quota,
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&cmd_opts.sum_surplus_transfers,
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&cmd_opts.quota,
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&cmd_opts.quota_criterion,
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&cmd_opts.quota_mode,
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133
src/stv/mod.rs
133
src/stv/mod.rs
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@ -23,6 +23,7 @@ pub mod wasm;
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use crate::numbers::Number;
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use crate::election::{Candidate, CandidateState, CountCard, CountState, Parcel, Vote};
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use itertools::Itertools;
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use wasm_bindgen::prelude::wasm_bindgen;
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use std::cmp::max;
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@ -35,6 +36,7 @@ pub struct STVOptions {
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pub round_weights: Option<usize>,
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pub round_votes: Option<usize>,
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pub round_quota: Option<usize>,
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pub sum_surplus_transfers: SumSurplusTransfersMode,
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pub quota: QuotaType,
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pub quota_criterion: QuotaCriterion,
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pub quota_mode: QuotaMode,
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@ -54,6 +56,7 @@ impl STVOptions {
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round_weights: Option<usize>,
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round_votes: Option<usize>,
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round_quota: Option<usize>,
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sum_transfers: &str,
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quota: &str,
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quota_criterion: &str,
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quota_mode: &str,
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@ -70,6 +73,12 @@ impl STVOptions {
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round_weights,
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round_votes,
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round_quota,
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sum_surplus_transfers: match sum_transfers {
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"single_step" => SumSurplusTransfersMode::SingleStep,
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"by_value" => SumSurplusTransfersMode::ByValue,
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"per_ballot" => SumSurplusTransfersMode::PerBallot,
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_ => panic!("Invalid --sum-transfers"),
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},
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quota: match quota {
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"droop" => QuotaType::Droop,
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"hare" => QuotaType::Hare,
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@ -134,6 +143,15 @@ impl STVOptions {
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}
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}
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#[wasm_bindgen]
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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pub enum SumSurplusTransfersMode {
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SingleStep,
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ByValue,
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PerBallot,
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}
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#[wasm_bindgen]
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#[derive(Clone, Copy)]
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#[derive(PartialEq)]
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@ -581,6 +599,7 @@ where
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fn distribute_surpluses<N: Number>(state: &mut CountState<N>, opts: &STVOptions) -> bool
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where
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for<'r> &'r N: ops::Sub<&'r N, Output=N>,
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for<'r> &'r N: ops::Div<&'r N, Output=N>,
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for<'r> &'r N: ops::Neg<Output=N>
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{
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let quota = state.quota.as_ref().unwrap();
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@ -620,7 +639,7 @@ where
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}
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/// Return the denominator of the transfer value
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fn calculate_transfer_denom<N: Number>(surplus: &N, result: &NextPreferencesResult<N>, transferable_votes: &N, weighted: bool, transferable_only: bool) -> Option<N>
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fn calculate_surplus_denom<N: Number>(surplus: &N, result: &NextPreferencesResult<N>, transferable_votes: &N, weighted: bool, transferable_only: bool) -> Option<N>
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where
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for<'r> &'r N: ops::Sub<&'r N, Output=N>
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{
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@ -648,21 +667,21 @@ fn reweight_vote<N: Number>(
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num_ballots: &N,
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surplus: &N,
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weighted: bool,
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transfer_value: &Option<N>,
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transfer_denom: &Option<N>,
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surplus_fraction: &Option<N>,
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surplus_denom: &Option<N>,
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round_tvs: Option<usize>,
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rounding: Option<usize>) -> N
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{
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let mut result;
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match transfer_denom {
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match surplus_denom {
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Some(v) => {
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if let Some(_) = round_tvs {
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// Rounding requested: use the rounded transfer value
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if weighted {
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result = num_votes.clone() * transfer_value.as_ref().unwrap();
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result = num_votes.clone() * surplus_fraction.as_ref().unwrap();
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} else {
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result = num_ballots.clone() * transfer_value.as_ref().unwrap();
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result = num_ballots.clone() * surplus_fraction.as_ref().unwrap();
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}
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} else {
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// Avoid unnecessary rounding error by first multiplying by the surplus
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@ -686,11 +705,57 @@ fn reweight_vote<N: Number>(
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return result;
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}
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fn sum_surplus_transfers<N: Number>(entry: &NextPreferencesEntry<N>, surplus: &N, is_weighted: bool, surplus_fraction: &Option<N>, surplus_denom: &Option<N>, _state: &mut CountState<N>, opts: &STVOptions) -> N
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where
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for<'r> &'r N: ops::Div<&'r N, Output=N>,
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{
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match opts.sum_surplus_transfers {
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SumSurplusTransfersMode::SingleStep => {
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// Calculate transfer across all votes
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//state.logger.log_literal(format!("Transferring {:.0} ballot papers, totalling {:.dps$} votes.", entry.num_ballots, entry.num_votes, dps=opts.pp_decimals));
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return reweight_vote(&entry.num_votes, &entry.num_ballots, surplus, is_weighted, surplus_fraction, surplus_denom, opts.round_tvs, opts.round_votes);
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}
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SumSurplusTransfersMode::ByValue => {
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// Sum transfers by value
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let mut result = N::new();
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// Sort into parcels by value
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let mut votes: Vec<&Vote<N>> = entry.votes.iter().collect();
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votes.sort_unstable_by(|a, b| (&a.value / &a.ballot.orig_value).cmp(&(&b.value / &b.ballot.orig_value)));
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for (_value, parcel) in &votes.into_iter().group_by(|v| &v.value / &v.ballot.orig_value) {
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let mut num_votes = N::new();
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let mut num_ballots = N::new();
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for vote in parcel {
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num_votes += &vote.value;
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num_ballots += &vote.ballot.orig_value;
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}
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//state.logger.log_literal(format!("Transferring {:.0} ballot papers, totalling {:.dps$} votes, received at value {:.dps2$}.", num_ballots, num_votes, value, dps=opts.pp_decimals, dps2=max(opts.pp_decimals, 2)));
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result += reweight_vote(&num_votes, &num_ballots, surplus, is_weighted, surplus_fraction, surplus_denom, opts.round_tvs, opts.round_votes);
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}
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return result;
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}
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SumSurplusTransfersMode::PerBallot => {
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// Sum transfer per each individual ballot
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// TODO: This could be moved to distribute_surplus to avoid looping over the votes and calculating transfer values twice
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let mut result = N::new();
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for vote in entry.votes.iter() {
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result += reweight_vote(&vote.value, &vote.ballot.orig_value, surplus, is_weighted, surplus_fraction, surplus_denom, opts.round_tvs, opts.round_votes);
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}
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//state.logger.log_literal(format!("Transferring {:.0} ballot papers, totalling {:.dps$} votes.", entry.num_ballots, entry.num_votes, dps=opts.pp_decimals));
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return result;
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}
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}
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}
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fn distribute_surplus<N: Number>(state: &mut CountState<N>, opts: &STVOptions, elected_candidate: &Candidate)
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where
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for<'r> &'r N: ops::Sub<&'r N, Output=N>,
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for<'r> &'r N: ops::Div<&'r N, Output=N>,
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for<'r> &'r N: ops::Neg<Output=N>
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{
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state.logger.log_literal(format!("Surplus of {} distributed.", elected_candidate.name));
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let count_card = state.candidates.get(elected_candidate).unwrap();
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let surplus = &count_card.votes - state.quota.as_ref().unwrap();
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@ -725,47 +790,54 @@ where
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};
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let transferable_votes = &result.total_votes - &result.exhausted.num_votes;
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let transfer_denom = calculate_transfer_denom(&surplus, &result, &transferable_votes, is_weighted, opts.transferable_only);
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let mut transfer_value;
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match transfer_denom {
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let surplus_denom = calculate_surplus_denom(&surplus, &result, &transferable_votes, is_weighted, opts.transferable_only);
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let mut surplus_fraction;
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match surplus_denom {
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Some(ref v) => {
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transfer_value = Some(surplus.clone() / v);
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surplus_fraction = Some(surplus.clone() / v);
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// Round down if requested
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if let Some(dps) = opts.round_tvs {
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transfer_value.as_mut().unwrap().floor_mut(dps);
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surplus_fraction.as_mut().unwrap().floor_mut(dps);
|
||||
}
|
||||
|
||||
state.logger.log_literal(format!("Surplus of {} distributed at value {:.dps2$}.", elected_candidate.name, transfer_value.as_ref().unwrap(), dps2=max(opts.pp_decimals, 2)));
|
||||
if opts.transferable_only {
|
||||
state.logger.log_literal(format!("Transferring {:.0} transferable ballots, totalling {:.dps$} transferable votes, with surplus fraction {:.dps2$}.", &result.total_ballots - &result.exhausted.num_ballots, transferable_votes, surplus_fraction.as_ref().unwrap(), dps=opts.pp_decimals, dps2=max(opts.pp_decimals, 2)));
|
||||
} else {
|
||||
state.logger.log_literal(format!("Transferring {:.0} ballots, totalling {:.dps$} votes, with surplus fraction {:.dps2$}.", result.total_ballots, result.total_votes, surplus_fraction.as_ref().unwrap(), dps=opts.pp_decimals, dps2=max(opts.pp_decimals, 2)));
|
||||
}
|
||||
}
|
||||
None => {
|
||||
transfer_value = None;
|
||||
state.logger.log_literal(format!("Surplus of {} distributed at values received.", elected_candidate.name));
|
||||
surplus_fraction = None;
|
||||
|
||||
if opts.transferable_only {
|
||||
state.logger.log_literal(format!("Transferring {:.0} transferable ballots, totalling {:.dps$} transferable votes, at values received.", &result.total_ballots - &result.exhausted.num_ballots, transferable_votes, dps=opts.pp_decimals));
|
||||
} else {
|
||||
state.logger.log_literal(format!("Transferring {:.0} ballots, totalling {:.dps$} votes, at values received.", result.total_ballots, result.total_votes, dps=opts.pp_decimals));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
let mut checksum = N::new();
|
||||
|
||||
for (candidate, entry) in result.candidates.into_iter() {
|
||||
// Credit transferred votes
|
||||
let candidate_transfers = sum_surplus_transfers(&entry, &surplus, is_weighted, &surplus_fraction, &surplus_denom, state, opts);
|
||||
let count_card = state.candidates.get_mut(candidate).unwrap();
|
||||
count_card.transfer(&candidate_transfers);
|
||||
checksum += candidate_transfers;
|
||||
|
||||
let mut parcel = entry.votes as Parcel<N>;
|
||||
|
||||
// Reweight votes
|
||||
for vote in parcel.iter_mut() {
|
||||
vote.value = reweight_vote(&vote.value, &vote.ballot.orig_value, &surplus, is_weighted, &transfer_value, &transfer_denom, opts.round_tvs, opts.round_weights);
|
||||
vote.value = reweight_vote(&vote.value, &vote.ballot.orig_value, &surplus, is_weighted, &surplus_fraction, &surplus_denom, opts.round_tvs, opts.round_weights);
|
||||
}
|
||||
|
||||
let count_card = state.candidates.get_mut(candidate).unwrap();
|
||||
count_card.parcels.push(parcel);
|
||||
|
||||
let candidate_transfers = reweight_vote(&entry.num_votes, &entry.num_ballots, &surplus, is_weighted, &transfer_value, &transfer_denom, opts.round_tvs, opts.round_votes);
|
||||
count_card.transfer(&candidate_transfers);
|
||||
checksum += candidate_transfers;
|
||||
}
|
||||
|
||||
// Transfer exhausted votes
|
||||
let parcel = result.exhausted.votes as Parcel<N>;
|
||||
state.exhausted.parcels.push(parcel);
|
||||
|
||||
// Credit exhausted votes
|
||||
let mut exhausted_transfers;
|
||||
if opts.transferable_only {
|
||||
if transferable_votes > surplus {
|
||||
|
|
@ -773,17 +845,22 @@ where
|
|||
exhausted_transfers = N::new();
|
||||
} else {
|
||||
exhausted_transfers = &surplus - &transferable_votes;
|
||||
|
||||
if let Some(dps) = opts.round_votes {
|
||||
exhausted_transfers.floor_mut(dps);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
exhausted_transfers = reweight_vote(&result.exhausted.num_votes, &result.exhausted.num_ballots, &surplus, is_weighted, &transfer_value, &transfer_denom, opts.round_tvs, opts.round_votes);
|
||||
exhausted_transfers = sum_surplus_transfers(&result.exhausted, &surplus, is_weighted, &surplus_fraction, &surplus_denom, state, opts);
|
||||
}
|
||||
|
||||
if let Some(dps) = opts.round_votes {
|
||||
exhausted_transfers.floor_mut(dps);
|
||||
}
|
||||
state.exhausted.transfer(&exhausted_transfers);
|
||||
checksum += exhausted_transfers;
|
||||
|
||||
// Transfer exhausted votes
|
||||
let parcel = result.exhausted.votes as Parcel<N>;
|
||||
state.exhausted.parcels.push(parcel);
|
||||
|
||||
// Finalise candidate votes
|
||||
let count_card = state.candidates.get_mut(elected_candidate).unwrap();
|
||||
count_card.transfers = -&surplus;
|
||||
|
|
|
|||
|
|
@ -59,6 +59,7 @@ fn aec_tas19_rational() {
|
|||
round_weights: None,
|
||||
round_votes: Some(0),
|
||||
round_quota: Some(0),
|
||||
sum_surplus_transfers: stv::SumSurplusTransfersMode::SingleStep,
|
||||
quota: stv::QuotaType::Droop,
|
||||
quota_criterion: stv::QuotaCriterion::GreaterOrEqual,
|
||||
quota_mode: stv::QuotaMode::Static,
|
||||
|
|
|
|||
|
|
@ -33,6 +33,7 @@ fn ers97_rational() {
|
|||
round_weights: Some(2),
|
||||
round_votes: Some(2),
|
||||
round_quota: Some(2),
|
||||
sum_surplus_transfers: stv::SumSurplusTransfersMode::SingleStep,
|
||||
quota: stv::QuotaType::DroopExact,
|
||||
quota_criterion: stv::QuotaCriterion::GreaterOrEqual,
|
||||
quota_mode: stv::QuotaMode::ERS97,
|
||||
|
|
|
|||
|
|
@ -27,6 +27,7 @@ fn prsa1_rational() {
|
|||
round_weights: Some(3),
|
||||
round_votes: Some(3),
|
||||
round_quota: Some(3),
|
||||
sum_surplus_transfers: stv::SumSurplusTransfersMode::SingleStep,
|
||||
quota: stv::QuotaType::Droop,
|
||||
quota_criterion: stv::QuotaCriterion::GreaterOrEqual,
|
||||
quota_mode: stv::QuotaMode::Static,
|
||||
|
|
|
|||
|
|
@ -34,6 +34,7 @@ fn scotland_linn07_fixed5() {
|
|||
round_weights: None,
|
||||
round_votes: None,
|
||||
round_quota: Some(0),
|
||||
sum_surplus_transfers: stv::SumSurplusTransfersMode::PerBallot,
|
||||
quota: stv::QuotaType::Droop,
|
||||
quota_criterion: stv::QuotaCriterion::GreaterOrEqual,
|
||||
quota_mode: stv::QuotaMode::Static,
|
||||
|
|
|
|||
Loading…
Reference in New Issue