[WebGL2] An error occurs for AVERAGE_POOL_2D operation with WebGL2 backend on Android

[Christywl]

Test Env:
Chromium Version: nightly build 70.0.3503.0 (b7ce158)
Platform: Android Goolge Pixel 2(8.1.0)

Expected Result:
The test should pass.

Actual Result:
An error occurs for AVERAGE_POOL_2D operation with WebGL2 backend.

Uncaught (in promise) Error: [Tensor] Tensor shape[1] 10000 > MAX_TEXTURE_SIZE 4096
    at Tensor.createGLTexture (webml-polyfill.js:884)
    at AveragePool2D._createIndexMap (webml-polyfill.js:8881)
    at AveragePool2D.call (webml-polyfill.js:8896)
    at webml-polyfill.js:8201
    at Array.forEach (<anonymous>)
    at webml-polyfill.js:8163
    at new Promise (<anonymous>)
    at Model._execute (webml-polyfill.js:8155)
    at webml-polyfill.js:8119
    at Model.execute (webml-polyfill.js:8134)

How to Reproduce:

1. Launch chromium and disable WebML flag

2. Visit https://brucedai.github.io/nt/test/avg_pool_2d.html?backend=webgl2

   • check result for Avg pool float example/2
   • check result for Avg pool float example/4

Similar issue: #182

[GreyZzzzzzXh]

This bug has been fixed by replacing webgl2 with tfjs-core (PR #297).

[Christywl]

This issue can't reproduce on webgl backend on Android nightly build 6540a81.