diff --git a/sandbox/package.json b/sandbox/package.json
index fe23156..8e6a201 100644
--- a/sandbox/package.json
+++ b/sandbox/package.json
@@ -14,6 +14,7 @@
 		"@surma/rollup-plugin-off-main-thread": "^2.2.3",
 		"@types/sql.js": "^1.4.9",
 		"@types/surma__rollup-plugin-off-main-thread": "^2.2.3",
+		"@types/papaparse": "^5.3.14",
 		"prettier": "^3.2.5",
 		"sass": "^1.71.1",
 		"solid-devtools": "^0.29.3",
@@ -23,6 +24,7 @@
 	},
 	"dependencies": {
 		"@popperjs/core": "^2.11.8",
+		"papaparse": "^5.4.1",
 		"bootstrap": "^5.3.3",
 		"fsrs-browser": "link:../pkg",
 		"solid-js": "^1.8.15",
diff --git a/sandbox/pnpm-lock.yaml b/sandbox/pnpm-lock.yaml
index 9bda670..84806c5 100644
--- a/sandbox/pnpm-lock.yaml
+++ b/sandbox/pnpm-lock.yaml
@@ -1,4 +1,4 @@
-lockfileVersion: '6.1'
+lockfileVersion: '6.0'
 
 settings:
   autoInstallPeers: true
@@ -14,6 +14,9 @@ dependencies:
   fsrs-browser:
     specifier: link:../pkg
     version: link:../pkg
+  papaparse:
+    specifier: ^5.4.1
+    version: 5.4.1
   solid-js:
     specifier: ^1.8.15
     version: 1.8.15
@@ -25,6 +28,9 @@ devDependencies:
   '@surma/rollup-plugin-off-main-thread':
     specifier: ^2.2.3
     version: 2.2.3
+  '@types/papaparse':
+    specifier: ^5.3.14
+    version: 5.3.14
   '@types/sql.js':
     specifier: ^1.4.9
     version: 1.4.9
@@ -865,6 +871,12 @@ packages:
       undici-types: 5.26.5
     dev: true
 
+  /@types/papaparse@5.3.14:
+    resolution: {integrity: sha512-LxJ4iEFcpqc6METwp9f6BV6VVc43m6MfH0VqFosHvrUgfXiFe6ww7R3itkOQ+TCK6Y+Iv/+RnnvtRZnkc5Kc9g==}
+    dependencies:
+      '@types/node': 20.11.20
+    dev: true
+
   /@types/sql.js@1.4.9:
     resolution: {integrity: sha512-ep8b36RKHlgWPqjNG9ToUrPiwkhwh0AEzy883mO5Xnd+cL6VBH1EvSjBAAuxLUFF2Vn/moE3Me6v9E1Lo+48GQ==}
     dependencies:
@@ -1615,6 +1627,9 @@ packages:
       has-symbols: 1.0.3
       object-keys: 1.1.1
     dev: true
+  /papaparse@5.4.1:
+    resolution: {integrity: sha512-HipMsgJkZu8br23pW15uvo6sib6wne/4woLZPlFf3rpDyMe9ywEXUsuD7+6K9PRkJlVT51j/sCOYDKGGS3ZJrw==}
+    dev: false
 
   /picocolors@1.0.0:
     resolution: {integrity: sha512-1fygroTLlHu66zi26VoTDv8yRgm0Fccecssto+MhsZ0D/DGW2sm8E8AjW7NU5VVTRt5GxbeZ5qBuJr+HyLYkjQ==}
diff --git a/sandbox/postinstall.sh b/sandbox/postinstall.sh
index e6de6eb..5618265 100755
--- a/sandbox/postinstall.sh
+++ b/sandbox/postinstall.sh
@@ -5,3 +5,4 @@ cp ./node_modules/sql.js/dist/sql-wasm.wasm ./src/assets/sql-wasm.wasm
 mkdir -p ./public/
 wget -nc -O ./public/collection.anki21.zip https://github.com/open-spaced-repetition/fsrs-optimizer-burn/files/12394182/collection.anki21.zip
 unzip -n ./public/collection.anki21.zip -d ./public
+wget -nc -O ./public/revlog.csv https://github.com/open-spaced-repetition/fsrs4anki/files/12515294/revlog.csv
\ No newline at end of file
diff --git a/sandbox/src/App.tsx b/sandbox/src/App.tsx
index 368a8ef..eb5291c 100644
--- a/sandbox/src/App.tsx
+++ b/sandbox/src/App.tsx
@@ -42,7 +42,7 @@ const App: Component = () => {
 			</button>
 			<label>
 				Train with custom file
-				<input type='file' onChange={customFile} accept='.anki21' />
+				<input type='file' onChange={customFile} accept='.anki21, .csv'/>
 			</label>
 			<button onclick={testSerialization}>
 				<div>Test Serialization</div>
@@ -62,7 +62,12 @@ async function customFile(
 		// My mental static analysis says to use `currentTarget`, but it seems to randomly be null, hence `target`. I'm confused but whatever.
 		event.target.files?.item(0) ?? throwExp('There should be a file selected')
 	let ab = await file.arrayBuffer()
-	train({ data: ab })
+	if (file.name.endsWith('.csv')) {
+		train({data: file})
+	} else {
+		train({data: ab})
+	}
+
 }
 
 export default App
diff --git a/sandbox/src/train.ts b/sandbox/src/train.ts
index ddc03f4..4ebd31b 100644
--- a/sandbox/src/train.ts
+++ b/sandbox/src/train.ts
@@ -1,6 +1,7 @@
 import wasm, { initThreadPool, Fsrs } from 'fsrs-browser/fsrs_browser'
 import initSqlJs, { type Database } from 'sql.js'
 import sqliteWasmUrl from './assets/sql-wasm.wasm?url'
+import * as papa from "papaparse";
 
 // @ts-ignore https://github.com/rustwasm/console_error_panic_hook#errorstacktracelimit
 Error.stackTraceLimit = 30
@@ -9,14 +10,16 @@ const sqlJs = initSqlJs({
 	locateFile: () => sqliteWasmUrl,
 })
 
-export const train = async (event: { data: 'autotrain' | ArrayBuffer }) => {
+export const train = async (event: { data: 'autotrain' | ArrayBuffer | File }) => {
 	if (event.data === 'autotrain') {
 		let db = await fetch('/collection.anki21')
 		let ab = await db.arrayBuffer()
 		loadSqliteAndRun(ab)
 	} else if (event.data instanceof ArrayBuffer) {
 		loadSqliteAndRun(event.data)
-	}
+    } else if (event.data instanceof File) {
+        csvTrain(event.data)
+    }
 }
 
 async function loadSqliteAndRun(ab: ArrayBuffer) {
@@ -68,6 +71,64 @@ async function loadSqliteAndRun(ab: ArrayBuffer) {
 	}
 }
 
+
+// use the csv file to train the model
+// dataset: https://github.com/open-spaced-repetition/fsrs4anki/issues/450
+interface ParseData {
+    review_time: string,
+    card_id: string,
+    review_rating: string,
+    review_duration: string,
+    review_state: string
+}
+
+interface csvTrainDataItem {
+    card_id: bigint,
+    review_time: bigint,
+    review_state: number,
+    review_rating: number
+}
+async function csvTrain(csv: File) {
+    await wasm()
+    await initThreadPool(navigator.hardwareConcurrency)
+    await sleep(1000) // the workers need time to spin up. TODO, post an init message and await a response. Also maybe move worker construction to Javascript.
+    console.time('full training time')
+    const result: csvTrainDataItem[] = [];
+    const fsrs = new Fsrs()
+    papa.parse<ParseData>(csv, {
+        header: true,
+        delimiter: ",",
+        step: function (row) {
+            const data = row.data;
+            if (data.card_id === undefined) return;
+            result.push({
+                card_id: BigInt(data.card_id),
+                review_time: BigInt(data.review_time),
+                review_state: Number(data.review_state),
+                review_rating: Number(data.review_rating),
+            });
+        },
+        complete: function (_) {
+            const cids: BigInt64Array = new BigInt64Array([
+                ...result.map((r) => r.card_id),
+            ]);
+            const eases: Uint8Array = new Uint8Array([
+                ...result.map((r) => r.review_rating),
+            ]);
+            const ids: BigInt64Array = new BigInt64Array([
+                ...result.map((r) => r.review_time),
+            ]);
+            const types: Uint8Array = new Uint8Array([
+                ...result.map((r) => r.review_state),
+            ]);
+            const weights = fsrs.computeWeightsAnki(cids, eases, ids, types)
+            console.timeEnd('full training time')
+            console.log('trained weights are', weights)
+            console.log('revlog count', result.length)
+        },
+    });
+}
+
 async function getDb(ab: ArrayBuffer): Promise<Database> {
 	const sql = await sqlJs
 	return new sql.Database(new Uint8Array(ab))