Error: Unable to resolve module ../models/mobilenet_v3_small.ptl from /Users/ziyuanzhou/Desktop/signdectection/signdetection/src/screens/CameraScreenTest.js: about playtorch HOT 5 CLOSED

Hi @JohnZcp - I'd first ensure the model file exists and is non-zero, and second that the relative require() path is correct. These are the two things that usually trip me up here.

Given that you're loading require('../models/mobilenet_v3_small.ptl'); from within /Users/ziyuanzhou/Desktop/signdectection/signdetection/src/screens/CameraScreenTest.js I would expect it to resolve to /Users/ziyuanzhou/Desktop/signdectection/signdetection/src/models/mobilenet_v3_small.ptl and so:

ls -lh /Users/ziyuanzhou/Desktop/signdectection/signdetection/src/models/mobilenet_v3_small.ptl

My guess is that you need another ../ in the relative require() path, since in the default project template, models/ is at the same level as src/.

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models/ and screens/ are at the same level, they are in the src/. I tried to enter the path layer by layer, and it seems like my project just doesn't recognize this .ptl type file.

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I don't know what backs the autocomplete in your editor, but the asset loading is handled by Metro, and that is driven by the metro.config.js at the project root. To support the model files, the .ptl extension is added to resolver.assetExts.

From your error message, it almost seems like Metro is trying a regex (for the given extensions) and that .ptl is not present. I don't know why that would be.

Did the default project template work for you? At what point did model loading break?

Hmm, looking at the Metro documentation, I see there is assetExts as well as sourceExts: https://facebook.github.io/metro/docs/configuration/#resolver-options

I wonder if sourceExts is used for files below the src/ directory, and assetExts elsewhere. Can you try moving models/ up a level to be a peer to src/?

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Thanks for your help. I just figure out the problem. All I need is to do is adding the .ptl extension in sourceExts in metro.config.js, and be sure the model file is placed under src/ .

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I'm glad to hear that you found a solution, @JohnZcp!

One more thing you might want to check is to ensure that this works in the release build. Metro handles file loading differently in dev mode and release mode, and it may have an impact on your approach here.

For example, if you normally build in dev mode with yarn android, try out release mode with yarn android --variant=release.

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