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import { type RuntimeValue } from '$lib/schemas/metadata.js';
import { avg, mapValues, nonnull } from '$lib/utils.js';
import { switchOnMetadataType, type RuntimeValuesPerType } from './types.js';
export const MERGEABLE_METADATA_TYPES: Set<DB.MetadataType> = new Set([
'boolean',
'integer',
'float',
'date',
'location',
'boundingbox',
'enum'
]);
/**
* Merge metadata values from images and observations. For every metadata key, the value is taken from the merged values of observation overrides if there exists at least one, otherwise from the merged values of the images.
*/
export function mergeMetadataFromImagesAndObservations({
definitions,
images,
observations
}: {
definitions: DB.Metadata[];
images: DB.Image[];
observations: DB.Observation[];
}) {
// TODO improve performance by passing a cache
// const options = await Promise.all(
// definitions.map(async (def) => {
// if (def.type !== 'enum') return [def.id, []] as const;
// const parsedId = splitMetadataId(def.id);
// if (!parsedId.namespace) {
// throw new Error(`Cannot get options for non-namespaced metadata ID ${def.id}`);
// }
// const opts = await db.getAll(
// 'MetadataOption',
// metadataOptionsKeyRange(parsedId.namespace, parsedId.id)
// );
// return [def.id, opts] as const;
// })
// ).then((entries) => Object.fromEntries(entries));
const mergedValues = mergeMetadataValues(
images.map((img) => img.metadata),
{ definitions }
);
const mergedOverrides = mergeMetadataValues(
observations.map((obs) => obs.metadataOverrides),
{ definitions }
);
const keys = new Set([...Object.keys(mergedValues), ...Object.keys(mergedOverrides)]);
const output: Record<string, DB.MetadataValue & { merged: boolean }> = {};
for (const key of keys) {
const value = mergedOverrides[key] ?? mergedValues[key];
Eif (value) output[key] = value;
}
return output;
}
export function mergeMetadataValues(
values: Array<DB.MetadataValues>,
{
definitions,
options = {}
}: {
definitions: DB.Metadata[];
/** Key is id of the metadata */
options?: Record<string, DB.MetadataEnumVariant[]>;
}
): Record<string, DB.MetadataValue & { merged: boolean }> {
Iif (values.length === 1) {
return mapValues(values[0], (v) => ({ ...v, merged: false }));
}
const output: Record<string, DB.MetadataValue & { merged: boolean }> = {};
const keys = new Set(values.flatMap((singleSubjectValues) => Object.keys(singleSubjectValues)));
for (const key of keys) {
const definition = definitions.find((def) => def.id === key);
if (!definition) {
console.warn(`Cannot merge metadata values for unknown key ${key}`);
continue;
}
const valuesOfKey = values.flatMap((singleSubjectValues) =>
Object.entries(singleSubjectValues)
.filter(([k]) => k === key)
.map(([, v]) => v)
);
const merged = mergeMetadata(definition, valuesOfKey, options[key] ?? []);
if (merged !== null && merged !== undefined)
output[key] = {
...merged,
merged: new Set(valuesOfKey.map((v) => JSON.stringify(v.value))).size > 1
};
}
return output;
}
function mergeMetadata(
definition: DB.Metadata,
values: DB.MetadataValue[],
options: DB.MetadataEnumVariant[] = []
) {
const mergeAlternatives = (
merger: (probabilities: number[]) => number,
values: DB.MetadataValue[]
) =>
Object.fromEntries(
values
.flatMap((v) => Object.keys(v.alternatives))
.map((valueAsString) => [
valueAsString,
merger(
values.flatMap((v) => v.alternatives[valueAsString] ?? null).filter(Boolean)
)
])
);
const mergeFullValue = ({
value,
confidences
}: {
value: RuntimeValue;
confidences: (probabilities: number[]) => number;
}): DB.MetadataValue => ({
value,
manuallyModified: values.some((v) => v.manuallyModified),
confidence: confidences(values.map((v) => v.confidence)),
confirmed: values.every((v) => v.confirmed),
alternatives: mergeAlternatives(confidences, values)
});
switch (definition.mergeMethod) {
case 'average':
return mergeFullValue({
confidences: avg,
value: mergeByAggregate({
aggregate: avg,
type: definition.type,
values: values.map((v) => v.value),
options
})
});
case 'max':
case 'min':
return mergeFullValue({
confidences: max,
value: mergeByMajority(
definition.type,
values,
definition.mergeMethod === 'max' ? max : min
)
});
case 'median':
return mergeFullValue({
confidences: median,
value: mergeByAggregate({
aggregate: median,
type: definition.type,
values: values.map((v) => v.value),
options
})
});
case 'union':
return mergeFullValue({
confidences: avg,
value: mergeByUnion(
definition.type,
values.map((v) => v.value)
)
});
case 'none':
return null;
}
}
/**
* Merge values by best confidence. If multiple values have the same confidence, use `strategy` to break the tie. If `strategy` throws, use first value as a fallback.
*/
function mergeByMajority<Type extends DB.MetadataType, Value extends RuntimeValue<Type>>(
_type: Type,
values: Array<{ value: Value; confidence: number }>,
strategy: (values: Value[]) => Value
): Value {
const bestConfidence = Math.max(...values.map((v) => v.confidence));
const bestValues = values.filter((v) => v.confidence === bestConfidence);
try {
return strategy(bestValues.map((v) => v.value));
} catch (error) {
console.error(error);
return bestValues[0].value;
}
}
/**
* Merge values by a numerical aggregation function, such as average or median.
*/
function mergeByAggregate<Type extends DB.MetadataType, Value extends RuntimeValue<Type>>({
type,
values,
options,
aggregate
}: {
type: Type;
values: Value[];
options: DB.MetadataEnumVariant[];
aggregate: (vals: number[]) => number;
}) {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return switchOnMetadataType<any, RuntimeValuesPerType>(
type,
values,
{
boolean: (...vals) => aggregate(toNumber('boolean', vals)) > 0.5,
integer: (...vals) => Math.ceil(aggregate(vals)),
float: (...vals) => aggregate(vals),
date: (...vals) => new Date(aggregate(toNumber('date', vals))),
location: (...vals) => ({
latitude: aggregate(vals.map((v) => v.latitude)),
longitude: aggregate(vals.map((v) => v.longitude))
}),
enum: (...vals) => {
// Get average index of values, and return closest option
const targetIndex = Math.round(
aggregate(
vals.map((v) => options.find((opt) => opt.key === v)?.index).filter(nonnull)
)
);
return options.find((opt) => opt.index === targetIndex)?.key ?? vals[0];
}
},
() => {
throw new Error(`Impossible de fusionner des valeurs de type ${type}`);
}
);
}
/**
* Merge values by union.
*/
function mergeByUnion(type: DB.MetadataType, values: Array<RuntimeValue>) {
return switchOnMetadataType<RuntimeValue<'boundingbox'>>(
type,
values,
{
boundingbox: (...vals) => {
const xStart = Math.min(...vals.map((v) => v.x));
const yStart = Math.min(...vals.map((v) => v.y));
const xEnd = Math.max(...vals.map((v) => v.x + v.w));
const yEnd = Math.max(...vals.map((v) => v.y + v.h));
return {
x: xStart,
y: yStart,
w: xEnd - xStart,
h: yEnd - yStart
};
}
},
() => {
throw new Error(`Impossible de fusionner des valeurs de type ${type} par union`);
}
);
}
/**
* Convert series of values to an output number
*/
function toNumber(
type: DB.MetadataType & ('integer' | 'float' | 'boolean' | 'date'),
values: Array<RuntimeValue<typeof type>>
) {
return values.map((value) =>
switchOnMetadataType<number>(
type,
value,
{
integer: (v) => v,
float: (v) => v,
boolean: (v) => (v ? 1 : 0),
date: (v) => new Date(v).getTime()
},
() => {
throw new Error(`Impossible de convertir des valeurs de type ${type} en nombre`);
}
)
);
}
function median(values: number[]) {
const sorted = values.sort((a, b) => a - b);
const middle = Math.floor(sorted.length / 2);
if (sorted.length % 2 === 0) {
return (sorted[middle - 1] + sorted[middle]) / 2;
}
return sorted[middle];
}
function max(values: number[]) {
return Math.max(...values);
}
function min(values: number[]) {
return Math.min(...values);
}
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