Improved README instructions for building in Termux on Android devices

[ghost]

Added direction to build with make, simplified OpenBlas, and CLBlast installation method. Clarified where to move models in Termux. llama.cpp is diverse, so I added a main Usage example for new users.

These instructions should work for any Android device capable of running llama.cpp.

[cebtenzzre]

What is $HOME meant to do? My Termux has the bash shell so running it as a command would just print an error.

[ghost]

What is $HOME meant to do? My Termux has the bash shell so running it as a command would just print an error.

Thanks for pointing that out. I expected $HOME to navigate to /data/data/com.termux/files/home in Termux.

I replaced $HOME for cd as it has the same effect.

$HOME is the executables directory in Termux. llama.cpp is significantly slower when loading a model from the downloads folder, for example.

[staviq]

If I remember correctly, android "sandboxes" apps such that native home folder is the app folder, and I checked with termux, not sure about other apps, but standard unix ~ works in termux, and resolves to /data/data/com.termux/files/home

Edit: I saw the diff, and I now know what you meant, but I agree $HOME is a bit confusing, so I would just say "termux app directory ( which is automatically mapped to home directory )" or something like that.

[ghost]

I would just say "termux app directory ( which is automatically mapped to home directory )" or something like that.

I removed $HOME because my intention is to make sure the User moves the model to the correct spot.

Thank you.

[cebtenzzre]

I removed $HOME because my intention is to make sure the User moves the model to the correct spot.

I think it would be sufficient to say "to the home directory (~/)". The example doesn't use its full path, and the user shouldn't have to know or care what the absolute path technically is.

[ghost]

@cebtenzzre Are there any other inconsistencies, or changes neccesary here?

[cebtenzzre]

Are there any other inconsistencies, or changes neccesary here?

Have you seen my review comments?

[ghost]

Have you seen my review comments?

Hmm, I don't see a review comment, other than a couple days ago: #2840 (comment) - I implemented the change here: 0a7ef3a

I don't know where it is.

[cebtenzzre]

Hmm, I don't see a review comment

Do you see them here?

edit: oops, looks like I made comments but forgot to submit the review.

[ghost]

Do you see them here?

I see now, let me check it out. Thank you.

[ghost]

regarding CLBlast, a Note from current master: (some Android devices, like the Zenfone 8, need the following command instead - "export LD_LIBRARY_PATH=/system/vendor/lib64:$LD_LIBRARY_PATH".), then it links to reddit.

Certain devices export from LD_LIBRARY_PATH=/vendor/, others export from LD_LIBRARY_PATH=/system/, so I think it makes sense to note the alternative for compatibility purposes.