CoreML execution provider fails with Parakeet CTC model: "broken/unsupported model" error

[altunenes]

Describe the issue

Hi! CoreML execution provider fails during inference with the Parakeet CTC ASR model. Model loads successfully but fails when running inference.

Non-zero status code returned while running 12615810092392341640_CoreML_12615810092392341640_3 node. Name:'CoreMLExecutionProvider_12615810092392341640_CoreML_12615810092392341640_3_3' Status Message: Error executing model:Unable to compute the prediction using a neural network model. It can be an invalid input data or broken/unsupported model (error code: -1).

env

• OS: macOS (Apple Silicon M3)
• ort: 2.0.0-rc.10 (rust binding: https://github.com/pykeio/ort)
• Model: https://huggingface.co/onnx-community/parakeet-ctc-0.6b-ONNX
• ep code: https://github.com/altunenes/parakeet-rs/blob/master/src/execution.rs

Is this a known limitation with CoreML? Are there specific ONNX operations in this model that CoreML doesn't support?

To reproduce

1. Download model files from HuggingFace: https://huggingface.co/onnx-community/parakeet-ctc-0.6b-ONNX/tree/main/onnx
   - model.onnx
   - model.onnx_data
   - tokenizer.json
2. Clone repo:
   git clone https://github.com/altunenes/parakeet-rs.git
   cd parakeet-rs
3. Download test audio:
   wget https://github.com/thewh1teagle/pyannote-rs/releases/download/v0.1.0/6_speakers.wav
4. Run a simple example via CoreML:
   cargo run --example transcribe 6_speakers.wav --features coreml

Urgency

No response

Platform

Mac

OS Version

15.6.1

ONNX Runtime Installation

Built from Source

ONNX Runtime Version or Commit ID

https://github.com/pykeio/ort/releases/tag/v2.0.0-rc.10

ONNX Runtime API

Other / Unknown

Architecture

ARM64

Execution Provider

CoreML

Execution Provider Library Version

No response

note: CoreML loads fine - it just can't execute the specific operations in this model. :(