use fprintf for diagnostic output, keep printf only for printing model output

[prusnak]

one can use ./main ... 2>/dev/null to suppress any diagnostic output

Fixes #5

[ggerganov]

No need to modify ggml.c and ggml.h - it does not print anything.

Keep only the rest of the changes

[prusnak]

Rebased on top of current master, kept only changes in main.cpp

[Godwinnna]

one can use ./main ... 2>dev/null to suppress any diagnostic output

Fixes #5

[Godwinnna]

Hello

[linonetwo]

What does this mean?

./chat --model "../model/ggml-alpaca-7b-q4.bin"  --prompt "Tell me a joke. End with Joke EOF." 2>dev/null  
zsh: no such file or directory: dev/null

---

The command 2>dev/null is used to redirect the standard error (stderr) output of a command to /dev/null, which is a special file in Unix-like systems that discards any data written to it. This is often used to suppress error messages or diagnostic output that may be displayed on the terminal.

In your case, it seems like there is a typo in the command. The correct syntax is /dev/null with a slash before dev, not dev/null. So the corrected command would be:

javascript
Copy code
./chat --model "../model/ggml-alpaca-7b-q4.bin" --prompt "Tell me a joke. End with Joke EOF." 2>/dev/null

This should redirect the stderr output of the ./chat command to /dev/null, effectively suppressing any diagnostic output that may be displayed on the terminal.

---

In Windows PowerShell, you can achieve a similar result of redirecting stderr output to null using the > operator to redirect the output stream and 2>&1 to redirect the error stream to the output stream.

Here's an example command:

java
Copy code
.\chat.exe --model "..\model\ggml-alpaca-7b-q4.bin" --prompt "Tell me a joke. End with Joke EOF." 2>&1 > $null

In this example, 2>&1 redirects the stderr stream to the stdout stream and > $null redirects the stdout stream to $null, which is a PowerShell automatic variable representing a null or empty value. This effectively discards any output from the command, including both stdout and stderr streams.

Note that the path separators in Windows PowerShell use a backslash () instead of a forward slash (/), and the executable extension for Windows is .exe instead of no extension.

[prusnak]

What does this mean?

Yes, there was a typo in my original post, it should read /dev/null, I updated the post.

[linonetwo]

Thanks, this helps when I was writing a function to call alpaca.cpp/llama.cpp from JS

https://github.com/linonetwo/langchain-alpaca/blob/1c519c206ea5152269c3d82d160a2567bbc9e69f/src/index.ts#L222-L282