Update grpc_tpu_worker.py file

PiperOrigin-RevId: 609469881

tensorflow/python/tools/grpc_tpu_worker.py

@@ -61,7 +61,11 @@ def setup_env_vars():
   os.environ['TPU_STDERR_LOG_LEVEL'] = '0'
   os.environ['CLOUD_TPU_TASK_ID'] = worker_id
   os.environ['TPU_LOCK_DEVICE'] = 'true'
-  os.environ['TPU_CHIPS_PER_HOST_BOUNDS'] = '2,2,1'
+  os.environ['TPU_MESH_CONTROLLER_ADDRESS'] = (
+      worker_network_endpoints.split(',')[0].split(':')[2] + ':8476'
+  )
+  os.environ['TPU_MESH_CONTROLLER_PORT'] = '8476'
+
   accelerator_type_to_host_bounds = {
       # v2
       'v2-8': '1,1,1',
@@ -78,29 +82,16 @@ def setup_env_vars():
       'v3-512': '8,8,1',
       'v3-1024': '8,16,1',
       'v3-2048': '16,16,1',
-      # v4
-      'v4-8': '1,1,1',
-      'v4-16': '1,1,2',
-      'v4-32': '1,1,4',
-      'v4-64': '1,2,4',
-      'v4-128': '2,2,4',
-      'v4-256': '2,2,8',
-      'v4-512': '2,4,8',
-      'v4-1024': '4,4,8',
-      'v4-2048': '4,4,16',
-      'v4-4096': '4,8,16',
-  }
 
-  os.environ['TPU_HOST_BOUNDS'] = accelerator_type_to_host_bounds[
-      accelerator_type]
-  os.environ['TPU_MESH_CONTROLLER_ADDRESS'] = worker_network_endpoints.split(
-      ',')[0].split(':')[2] + ':8476'
-  os.environ['TPU_MESH_CONTROLLER_PORT'] = '8476'
-
-  os.environ['TPU_STDERR_LOG_LEVEL'] = '0'
+  }
 
-  if accelerator_type not in ['v4-8', 'v4-16', 'v4-32', 'v4-64']:
-    os.environ['TPU_TOPOLOGY_WRAP'] = 'true,true,true'
+  # If v4 TPU don't set any topology related flags,
+  # libtpu will set these values.
+  if not (accelerator_type.startswith('v4-') or
+          accelerator_type.startswith('v5')):
+    os.environ['TPU_CHIPS_PER_HOST_BOUNDS'] = '2,2,1'
+    os.environ['TPU_HOST_BOUNDS'] = accelerator_type_to_host_bounds[
+        accelerator_type]
 
   # Set the hostname override.
   os.environ['TPU_HOSTNAME_OVERRIDE'] = get_host_ip()
@@ -111,7 +102,10 @@ def main(unused_args):
   server_def = tensorflow_server_pb2.ServerDef(protocol='grpc')
   job_def = server_def.cluster.job.add()
   job_def.name = 'tpu_worker'
-  job_def.tasks[0] = 'localhost:8470'
+  tpu_task_port = os.getenv('TPU_TASK_PORT')
+  if tpu_task_port is None or not tpu_task_port:
+    tpu_task_port = '8470'  # If TPU task port is not available, use 8470.
+  job_def.tasks[0] = 'localhost:' + tpu_task_port
   server_def.job_name = 'tpu_worker'
   server_def.task_index = 0