[Mobile] NNAPI cannot Split without num_outputs

[Ebola-Chan-bot]

Describe the issue

NNAPI on Android cannot perform Split version 18 without num_outputs attribute:

[ErrorCode:Fail] op_builder_helpers.cc:144 AddNnapiSplit count [0] does not evenly divide dimension 0 [2]

I investigated op_builder_helpers.cc:14. Looks like the logic sets num_outputs to zero as default if not specified. However Split works totally differently depending on whether num_outputs is specified or not.

To reproduce

Install OnnxRuntime from NuGet. Exception throws when creating InferenceSession with this model and NNAPI provider:

验证模型.zip

Illustrated by netron

This model works fine on Windows CUDA or CPU.

Urgency

No response

Platform

Android

OS Version

HarmonyOS 4.2

ONNX Runtime Installation

Released Package

Compiler Version (if 'Built from Source')

No response

Package Name (if 'Released Package')

Microsoft.ML.OnnxRuntime

ONNX Runtime Version or Commit ID

1.21.0

ONNX Runtime API

C#

Architecture

X64

Execution Provider

NNAPI

Execution Provider Library Version

No response

[snnn]

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