ort hooks into ONNX Runtime to route its logging messages through the tracing crate. These logging messages can often provide more helpful information about specific failure modes than ort’s error messages alone.
To enable logging for ort, you need to set up a tracing subscriber in your application, such as tracing-subscriber. tracing-subscriber’s fmt subscriber logs readable (and quite pretty!) messages to the console. To set it up:
Add tracing-subscriber to your dependencies
[dependencies]
tracing-subscriber = { version = "0.3", features = [ "env-filter", "fmt" ] }Initialize the subscriber in the main function
fn main() {
tracing_subscriber::fmt::init();
}Show debug messages from ort
The environment variable RUST_LOG configures filters for crates that use tracing; see tracing_subcriber::EnvFilter for more information.
Set RUST_LOG to ort=debug to see all debug messages from ort. (You can also set it to trace for more verbosity, or info, warn, or error for less.)
$env:RUST_LOG = 'ort=debug';
cargo run