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Created systematic tests to verify transformer learning on simple tasks: test_05_transformer_simple_patterns.py: - Test 1: Constant prediction (always predict 5) → 100% ✅ - Test 2: Copy task (failed due to causal masking) → Expected behavior - Test 3: Sequence completion ([0,1,2]→[1,2,3]) → 100% ✅ - Test 4: Pattern repetition ([a,b,a,b,...]) → 100% ✅ test_05_debug_copy_task.py: - Explains why copy task fails (causal masking) - Tests next-token prediction (correct task) → 100% ✅ - Tests memorization vs generalization → 50% (reasonable) Key insight: Autoregressive models predict NEXT token, not SAME token. Position 0 cannot see itself, so "copy" is impossible. The correct task is next-token prediction: [1,2,3,4]→[2,3,4,5] These tests prove the transformer architecture works correctly before attempting full Shakespeare training.