Safeguard against background removal pipeline precision issues #1255
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This PR safeguards against precision issues of the sigmoid node, specifically affecting the modnet model (only in CPU/WASM, not WebGPU).
This is because the code which detects whether the model output is already normalized assumes (correctly) that the output from a sigmoid node should be between 0 and 1, but the onnxruntime implementation sometimes outputs values above 1 or below 0.
See microsoft/onnxruntime#23943 for more information.