image-classification benchmark failed

[jlb6740]

root@4722daa600d1:/sightglass# /sightglass/target/release/sightglass-cli benchmark --processes=3 --engine /sightglass/engines/wasmtime/libengine.so --raw --output-format csv --output-file /sightglass/benchmarks//results//image-classification_wasm_results.csv -- /sightglass/benchmarks/image-classification/image-classification-benchmark.wasm
failed to instantiate

Caused by:
unknown import: wasi_ephemeral_nn::load has not been defined
thread 'main' panicked at 'assertion failed: (left == right)
left: -1,
right: 0', /sightglass/crates/recorder/src/bench_api.rs:221:9
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
Error: benchmark subprocess did not exit successfully

[rahulchaphalkar]

This error was due to not using --engine-flags="--wasi nn".
I've opened a PR to make setup of environment of the benchmark simpler.