[Webkit-unassigned] [Bug 226953] New: Tensorflow.js Broken in Safari 15

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226953

            Bug ID: 226953
           Summary: Tensorflow.js Broken in Safari 15
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heystoneybatter at gmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

OVERVIEW:
Getting a consistent vertex/shader error message across every Tensorflow.js demo on the developer release of iOS 15.0 (using Safari 15). These TFJS applications and and models currently run correctly in iOS 14.6 or 14.7.

ERROR LOG:
Internal error compiling shader with Metal backend.
Please submit this shader, or website as a bug to https://bugs.webkit.org
Error: Failed to link vertex and fragment shaders.

STEPS TO REPRODUCE:
A few websites/demos where you can reproduce the error when running the applications in iOS 15 are:
https://emojiscavengerhunt.withgoogle.com/
https://magenta.tensorflow.org/demos/performance_rnn/index.html
https://storage.googleapis.com/tfjs-examples/addition-rnn/dist/index.html

If more code samples are needed, they can also be accessed here: 
https://www.tensorflow.org/js/demos

ACTUAL RESULTS:
The demos/programs error out as the models cannot be processed.

EXPECTED BEHAVIOR:
The applications above all run well in iOS 14.6 and 14.7 on my iPhone X.

HARDWARE:
The error occurs in Safari 15.0 in iOS 15 on my iPhone XS.

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