RAO/No owner deregistration

pallets/subtensor/src/subnets/registration.rs

@@ -425,6 +425,14 @@ impl<T: Config> Pallet<T> {
         }
 
         for neuron_uid in 0..neurons_n {
+            // Do not deregister the owner
+            if let Ok(hotkey) = Self::get_hotkey_for_net_and_uid(netuid, neuron_uid) {
+                let coldkey = Self::get_owning_coldkey_for_hotkey(&hotkey);
+                if Self::get_subnet_owner(netuid) == coldkey {
+                    continue;
+                }
+            }
+
             let pruning_score: u16 = Self::get_pruning_score_for_uid(netuid, neuron_uid);
             let block_at_registration: u64 =
                 Self::get_neuron_block_at_registration(netuid, neuron_uid);

pallets/subtensor/src/subnets/uids.rs

@@ -42,6 +42,20 @@ impl<T: Config> Pallet<T> {
         // 1. Get the old hotkey under this position.
         let old_hotkey: T::AccountId = Keys::<T>::get(netuid, uid_to_replace);
 
+        // Do not deregister the owner
+        let coldkey = Self::get_owning_coldkey_for_hotkey(&old_hotkey);
+        if Self::get_subnet_owner(netuid) == coldkey {
+            log::warn!(
+                "replace_neuron: Skipped replacement because neuron belongs to the subnet owner. \
+                 netuid: {:?}, uid_to_replace: {:?}, new_hotkey: {:?}, owner_coldkey: {:?}",
+                netuid,
+                uid_to_replace,
+                new_hotkey,
+                coldkey
+            );
+            return;
+        }
+
         // 2. Remove previous set memberships.
         Uids::<T>::remove(netuid, old_hotkey.clone());
         IsNetworkMember::<T>::remove(old_hotkey.clone(), netuid);

pallets/subtensor/src/tests/difficulty.rs

@@ -13,6 +13,10 @@ fn test_registration_difficulty_adjustment() {
         let tempo: u16 = 1;
         let modality: u16 = 1;
         add_network(netuid, tempo, modality);
+
+        // owners are not deregistered
+        crate::SubnetOwner::<Test>::insert(netuid, U256::from(99999));
+
         SubtensorModule::set_min_difficulty(netuid, 10000);
         assert_eq!(SubtensorModule::get_difficulty_as_u64(netuid), 10000); // Check initial difficulty.
         assert_eq!(SubtensorModule::get_last_adjustment_block(netuid), 0); // Last adjustment block starts at 0.

pallets/subtensor/src/tests/registration.rs

@@ -1560,6 +1560,12 @@ fn test_full_pass_through() {
         add_network(netuid1, tempo1, 0);
         add_network(netuid2, tempo2, 0);
 
+        // owners are not deregisterd
+        let dummy_owner = U256::from(99999);
+        crate::SubnetOwner::<Test>::insert(netuid0, dummy_owner);
+        crate::SubnetOwner::<Test>::insert(netuid1, dummy_owner);
+        crate::SubnetOwner::<Test>::insert(netuid2, dummy_owner);
+
         // Check their tempo.
         assert_eq!(SubtensorModule::get_tempo(netuid0), tempo0);
         assert_eq!(SubtensorModule::get_tempo(netuid1), tempo1);

pallets/subtensor/src/tests/uids.rs

@@ -250,3 +250,88 @@ fn test_neuron_certificate() {
         assert_err!(NeuronCertificate::try_from(data), ());
     });
 }
+
+#[test]
+fn test_replace_neuron_subnet_owner_not_replaced() {
+    new_test_ext(1).execute_with(|| {
+        let owner_hotkey = U256::from(100);
+        let owner_coldkey = U256::from(999);
+        let new_hotkey_account_id = U256::from(2);
+
+        let netuid = add_dynamic_network(&owner_hotkey, &owner_coldkey);
+        let neuron_uid = SubtensorModule::get_uid_for_net_and_hotkey(netuid, &owner_hotkey)
+            .expect("Owner neuron should be registered by add_dynamic_network");
+
+        let current_block = SubtensorModule::get_current_block_as_u64();
+        SubtensorModule::replace_neuron(netuid, neuron_uid, &new_hotkey_account_id, current_block);
+
+        let still_uid = SubtensorModule::get_uid_for_net_and_hotkey(netuid, &owner_hotkey);
+        assert_ok!(still_uid);
+        assert_eq!(
+            still_uid.unwrap(),
+            neuron_uid,
+            "UID should remain unchanged for subnet owner"
+        );
+
+        let new_key_uid =
+            SubtensorModule::get_uid_for_net_and_hotkey(netuid, &new_hotkey_account_id);
+        assert_err!(new_key_uid, Error::<Test>::HotKeyNotRegisteredInSubNet,);
+    });
+}
+
+#[test]
+fn test_get_neuron_to_prune_owner_not_pruned() {
+    new_test_ext(1).execute_with(|| {
+        let owner_hotkey = U256::from(123);
+        let owner_coldkey = U256::from(999);
+
+        let netuid = add_dynamic_network(&owner_hotkey, &owner_coldkey);
+
+        SubtensorModule::set_max_registrations_per_block(netuid, 100);
+        SubtensorModule::set_target_registrations_per_interval(netuid, 100);
+        SubnetOwner::<Test>::insert(netuid, owner_coldkey);
+
+        let owner_uid = SubtensorModule::get_uid_for_net_and_hotkey(netuid, &owner_hotkey)
+            .expect("Owner neuron should already be registered by add_dynamic_network");
+
+        let additional_hotkey_1 = U256::from(1000);
+        let additional_coldkey_1 = U256::from(2000);
+
+        let additional_hotkey_2 = U256::from(1001);
+        let additional_coldkey_2 = U256::from(2001);
+
+        register_ok_neuron(netuid, additional_hotkey_1, additional_coldkey_1, 0);
+        let uid_1 = SubtensorModule::get_uid_for_net_and_hotkey(netuid, &additional_hotkey_1)
+            .expect("Should be registered");
+
+        register_ok_neuron(netuid, additional_hotkey_2, additional_coldkey_2, 1);
+        let uid_2 = SubtensorModule::get_uid_for_net_and_hotkey(netuid, &additional_hotkey_2)
+            .expect("Should be registered");
+
+        SubtensorModule::set_pruning_score_for_uid(netuid, owner_uid, 0);
+        SubtensorModule::set_pruning_score_for_uid(netuid, uid_1, 1);
+        SubtensorModule::set_pruning_score_for_uid(netuid, uid_2, 2);
+
+        let pruned_uid = SubtensorModule::get_neuron_to_prune(netuid);
+
+        // - The pruned UID must be `uid_1` (score=1).
+        // - The owner's UID remains unpruned.
+        assert_eq!(
+            pruned_uid, uid_1,
+            "Should prune the neuron with pruning score=1, not the owner (score=0)."
+        );
+
+        let pruned_score = SubtensorModule::get_pruning_score_for_uid(netuid, uid_1);
+        assert_eq!(
+            pruned_score,
+            u16::MAX,
+            "Pruned neuron's score should be set to u16::MAX"
+        );
+
+        let owner_score = SubtensorModule::get_pruning_score_for_uid(netuid, owner_uid);
+        assert_eq!(
+            owner_score, 0,
+            "Owner's pruning score remains 0, indicating it was skipped"
+        );
+    });
+}