Remove runtime stderr warning from Python bindings (#1898)

* Initial plan

* Remove runtime stderr warning from Python bindings

Remove the eprintln! calls that printed a runtime warning to stderr
when the process was forked after parallelism had been used. The
set_parallelism(false) behavior is preserved to avoid deadlocks.

File changed: bindings/python/src/lib.rs
Commit OID referenced: a05b60c

Co-authored-by: ArthurZucker <[email protected]>

* Update comment to reflect the new behavior after removing warning

The comment now correctly states that the callback disables parallelism
instead of warning the user.

Co-authored-by: ArthurZucker <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: ArthurZucker <[email protected]>

Author: Copilot

bindings/python/src/lib.rs

@@ -37,22 +37,13 @@ pub const VERSION: &str = env!("CARGO_PKG_VERSION");
 
 // For users using multiprocessing in python, it is quite easy to fork the process running
 // tokenizers, ending up with a deadlock because we internally make use of multithreading. So
-// we register a callback to be called in the event of a fork so that we can warn the user.
+// we register a callback to be called in the event of a fork to disable parallelism.
 #[cfg(target_family = "unix")]
 static mut REGISTERED_FORK_CALLBACK: bool = false;
 #[cfg(target_family = "unix")]
 extern "C" fn child_after_fork() {
     use tk::parallelism::*;
     if has_parallelism_been_used() && !is_parallelism_configured() {
-        eprintln!(
-            "huggingface/tokenizers: The current process just got forked, after parallelism has \
-            already been used. Disabling parallelism to avoid deadlocks..."
-        );
-        eprintln!("To disable this warning, you can either:");
-        eprintln!(
-            "\t- Avoid using `tokenizers` before the fork if possible\n\
-            \t- Explicitly set the environment variable {ENV_VARIABLE}=(true | false)"
-        );
         set_parallelism(false);
     }
 }