File size: 4,690 Bytes
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import { useEffect, useState, useRef, useCallback, useMemo } from 'react';
import { apiClient } from '@/utils/api';
export interface LossPoint {
step: number;
wall_time?: number;
value: number | null;
}
type SeriesMap = Record<string, LossPoint[]>;
function isLossKey(key: string) {
// treat anything containing "loss" as a loss-series
// (covers loss, train_loss, val_loss, loss/xyz, etc.)
return /loss/i.test(key);
}
export default function useJobLossLog(jobID: string, reloadInterval: null | number = null) {
const [series, setSeries] = useState<SeriesMap>({});
const [keys, setKeys] = useState<string[]>([]);
const [status, setStatus] = useState<'idle' | 'loading' | 'success' | 'error' | 'refreshing'>('idle');
const didInitialLoadRef = useRef(false);
const inFlightRef = useRef(false);
// track last step per key so polling is incremental per series
const lastStepByKeyRef = useRef<Record<string, number | null>>({});
const lossKeys = useMemo(() => {
const base = (keys ?? []).filter(isLossKey);
// if keys table is empty early on, fall back to just "loss"
if (base.length === 0) return ['loss'];
return base.sort();
}, [keys]);
const refreshLoss = useCallback(async () => {
if (!jobID) return;
if (inFlightRef.current) return;
inFlightRef.current = true;
const loadStatus: 'loading' | 'refreshing' = didInitialLoadRef.current ? 'refreshing' : 'loading';
setStatus(loadStatus);
try {
// Step 1: get key list (we can do this by calling endpoint once; it returns keys)
// Keep it cheap: limit=1.
const first = await apiClient
.get(`/api/jobs/${jobID}/loss`, { params: { key: 'loss', limit: 1 } })
.then(res => res.data as { keys?: string[] });
const newKeys = first.keys ?? [];
setKeys(newKeys);
const wantedLossKeys = (newKeys.filter(isLossKey).length ? newKeys.filter(isLossKey) : ['loss']).sort();
// Step 2: fetch each loss key incrementally (since_step per key if polling)
const requests = wantedLossKeys.map(k => {
const params: Record<string, any> = { key: k };
if (reloadInterval && lastStepByKeyRef.current[k] != null) {
params.since_step = lastStepByKeyRef.current[k];
}
params.limit = 1000000;
return apiClient
.get(`/api/jobs/${jobID}/loss`, { params })
.then(res => res.data as { key: string; points?: LossPoint[] });
});
const results = await Promise.all(requests);
setSeries(prev => {
const next: SeriesMap = { ...prev };
for (const r of results) {
const k = r.key;
const newPoints = (r.points ?? []).filter(p => p.value !== null);
if (!didInitialLoadRef.current) {
// initial: replace
next[k] = newPoints;
} else if (newPoints.length) {
const existing = next[k] ?? [];
const prevLast = existing.length ? existing[existing.length - 1].step : null;
const filtered = prevLast == null ? newPoints : newPoints.filter(p => p.step > prevLast);
next[k] = filtered.length ? [...existing, ...filtered] : existing;
} else {
// no new points: keep existing
next[k] = next[k] ?? [];
}
// update last step per key
const finalArr = next[k] ?? [];
lastStepByKeyRef.current[k] = finalArr.length
? finalArr[finalArr.length - 1].step
: (lastStepByKeyRef.current[k] ?? null);
}
// remove stale loss keys that no longer exist (rare, but keeps UI clean)
for (const existingKey of Object.keys(next)) {
if (isLossKey(existingKey) && !wantedLossKeys.includes(existingKey)) {
delete next[existingKey];
delete lastStepByKeyRef.current[existingKey];
}
}
return next;
});
setStatus('success');
didInitialLoadRef.current = true;
} catch (err) {
console.error('Error fetching loss logs:', err);
setStatus('error');
} finally {
inFlightRef.current = false;
}
}, [jobID, reloadInterval]);
useEffect(() => {
// reset when job changes
didInitialLoadRef.current = false;
lastStepByKeyRef.current = {};
setSeries({});
setKeys([]);
setStatus('idle');
refreshLoss();
if (reloadInterval) {
const interval = setInterval(() => {
refreshLoss();
}, reloadInterval);
return () => clearInterval(interval);
}
}, [jobID, reloadInterval, refreshLoss]);
return { series, keys, lossKeys, status, refreshLoss, setSeries };
}
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