first working

cli/src/commands.rs

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+pub mod benchmark;
+pub mod play;
+pub mod train;

cli/src/commands/benchmark.rs

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+

cli/src/commands/train.rs

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+pub fn run() {
+
+    // train(TrainingConfig {}, );
+}

cli/src/main.rs

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+mod commands;
+
+use std::env;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    match args.get(1).map(|s| s.as_str()) {
+        Some("train") => commands::train::run(),
+        Some("selfplay") => commands::selfplay::run(),
+        Some("benchmark") => commands::benchmark::run(),
+        _ => {
+            println!("unknown command");
+        }
+    }
+}