Support loading weights from remote instance (#8215)

Signed-off-by: Anqi Shen <amy.saq@antgroup.com> Co-authored-by: Chayenne <74843776+zhaochenyang20@users.noreply.github.com>
2025-09-12 17:40:22 +08:00
parent 1b1701f1f7
commit 30d20ce84f
18 changed files with 1042 additions and 6 deletions
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: Apache-2.0
+
+import logging
+from typing import List
+
+import requests
+
+logger = logging.getLogger(__name__)
+
+
+def trigger_init_weights_send_group_for_remote_instance_request(
+    remote_instance_weight_loader_seed_instance_ip: str,
+    remote_instance_weight_loader_seed_instance_service_port: int,
+    remote_instance_weight_loader_send_weights_group_ports: List[int],
+    remote_instance_weight_loader_client_id: str,
+):
+    seed_instance_service_url = f"http://{remote_instance_weight_loader_seed_instance_ip}:{remote_instance_weight_loader_seed_instance_service_port}"
+    # Only support loading weights from instance with same parallelism strategy.
+    # Per TP rank pair between seed and dst instances will build a communication group for sending weights.
+    # i.e. seed TP 0 <-> dst TP 0, seed TP 1 <-> dst TP 1, etc.
+    # Each communication group will have a world size 2.
+    try:
+        requests.post(
+            f"{seed_instance_service_url}/init_weights_send_group_for_remote_instance",
+            json={
+                "master_address": remote_instance_weight_loader_seed_instance_ip,
+                "ports": (
+                    ",".join(
+                        str(p)
+                        for p in remote_instance_weight_loader_send_weights_group_ports
+                    )
+                ),
+                "group_rank": 0,
+                "world_size": 2,
+                "group_name": f"send_weights_{remote_instance_weight_loader_client_id}",
+                "backend": "nccl",
+            },
+        )
+    except Exception as e:
+        logger.error(
+            f"Failed to trigger init_weights_send_group_for_remote_instance_request to seed instance {seed_instance_service_url}: {e}."
+        )
+        raise
+
+
+def trigger_transferring_weights_request(
+    remote_instance_weight_loader_seed_instance_ip: str,
+    remote_instance_weight_loader_seed_instance_service_port: int,
+    remote_instance_weight_loader_send_weights_group_ports: List[int],
+    remote_instance_weight_loader_client_id: str,
+):
+    seed_instance_service_url = f"http://{remote_instance_weight_loader_seed_instance_ip}:{remote_instance_weight_loader_seed_instance_service_port}"
+    try:
+        requests.post(
+            f"{seed_instance_service_url}/send_weights_to_remote_instance",
+            json={
+                "master_address": remote_instance_weight_loader_seed_instance_ip,
+                "ports": (
+                    ",".join(
+                        str(p)
+                        for p in remote_instance_weight_loader_send_weights_group_ports
+                    )
+                ),
+                "group_name": f"send_weights_{remote_instance_weight_loader_client_id}",
+            },
+        )
+    except Exception as e:
+        logger.error(f"Failed to trigger send weights to remote instance request: {e}")
+        raise