regression: tensor is disposed early

[vladmandic]

upgrade to tfjs 4.3.0 from tfjs 4.2.0 and immediately hit a regression issue.
tested in browser using webgl and in nodejs using tensorflow backends, both have same problem.

basically, some tensors are disposed immediately after model execution.

simple reproduction

const tf = require('@tensorflow/tfjs-node');

async function main() {
  console.log(`tfjs: ${tf.version_core} backend: ${tf.getBackend()}`);
  const model = await tf.loadGraphModel('https://vladmandic.github.io/human/models/faceres.json');
  const inputShape = model.inputs[0].shape?.map((x) => Math.abs(x));
  const input = tf.randomUniform(inputShape, 0, 1, model.inputs[0].dtype);
  const res = model.execute(input);
  for (const t of res) console.log(t.shape, t.isDisposed);
}

main();

result:

tfjs: 4.3.0 backend: tensorflow
[ 1, 1 ] false
[ 1, 1024 ] true
[ 1, 100 ] false

likely introduced via #7392 and attempted to fix via #7445 (but issue still exists)
also related issue #7431

i've tried a workaround by explicitly listing output tensors, but it does not help:

      const outputs = model?.outputs.map((o) => o.name);
      const res = model.execute(input, outputs);

runtime error is obvious, but just to make it easily searchable by other users here's a stack trace:

node_modules/.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:3882
            throw new Error("Tensor is disposed.");
                  ^

Error: Tensor is disposed.
    at Tensor.throwIfDisposed (node_modules/.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:3882:19)
    at Tensor.<anonymous> (node_modules/.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:3761:30)
    at step (node_modules/.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:140:27)
    at Object.next (.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:89:53)
    at node_modules/.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:82:71
    at new Promise (<anonymous>)
    at __awaiter (node_modules/.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:68:12)
    at Tensor.data (node_modules/.pnpm/@[email protected]/node_modules/@tensorflow/tfjs-core/dist/tf-core.node.js:3756:16)

[mattsoulanille]

Thank you for reporting this issue. We are looking into it. In the meantime, we will deprecate the 4.3.0 npm release.

[google-ml-butler]

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