def _set_basic_info(self, loss, role_maker, user_defined_optimizer,
user_defined_strategy):
super(PipelineOptimizer,
self)._set_basic_info(loss, role_maker, user_defined_optimizer,
user_defined_strategy)
num_microbatches = user_defined_strategy.pipeline_configs[
'micro_batch']
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=num_microbatches)
def minimize_impl(self,
loss,
startup_program=None,
parameter_list=None,
no_grad_set=None):
endpoints = self.role_maker._get_trainer_endpoints()
current_endpoint = endpoints[self.role_maker._worker_index()]
self.local_rank = self._get_local_rank(current_endpoint, endpoints)
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=self.num_microbatches,
start_cpu_core_id=self.local_rank)
node_num = _get_node_num(endpoints)
gpus_per_node = len(endpoints) // node_num
self.startup_program = startup_program
self.local_rank = self._get_local_rank(current_endpoint, endpoints)
if startup_program is None:
self.startup_program = fluid.default_startup_program()
loss.block.program._pipeline_opt = dict()
loss.block.program._pipeline_opt['local_rank'] = self.local_rank
optimize_ops, params_grads, prog_list = \
self.wrapped_opt.minimize(loss, startup_program,
parameter_list, no_grad_set)
assert prog_list
self.main_program_list = prog_list
self.main_program = loss.block.program
self.inner_parallelism = loss.block.program._pipeline_opt[
'inner_parallelism']
nranks = len(endpoints)
self.nranks = nranks
self.nrings = len(self.main_program_list)
self.rank = self.role_maker._worker_index()
self.endpoints = endpoints
self.current_endpoint = current_endpoint
pipeline_helper = PipelineHelper(self.role_maker)
pipeline_helper.update_startup_program(
self.startup_program._pipeline_opt["startup_program"],
self.inner_parallelism)
self._transpile_main_program(loss, node_num, gpus_per_node)
return optimize_ops, params_grads
def minimize_impl(self,
loss,
startup_program=None,
parameter_list=None,
no_grad_set=None):
endpoints = self.role_maker._get_trainer_endpoints()
current_endpoint = endpoints[self.role_maker._worker_index()]
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=self.num_microbatches)
node_num = _get_node_num(endpoints)
gpus_per_node = len(endpoints) // node_num
self.startup_program = startup_program
if startup_program is None:
self.startup_program = fluid.default_startup_program()
self.rank = self.role_maker._worker_index()
self.nranks = self.role_maker._worker_num()
assert self.nranks % node_num == 0
loss.block.program._pipeline_opt = dict()
loss.block.program._pipeline_opt['local_rank'] = self.rank
loss.block.program._pipeline_opt[
'micro_batch_size'] = self.micro_batch_size
loss.block.program._pipeline_opt['schedule_mode'] = self.schedule_mode
optimize_ops, params_grads, prog_list = self.wrapped_opt.minimize(
loss, startup_program, parameter_list, no_grad_set)
assert prog_list
self.main_program_list = prog_list
self.main_program = loss.block.program
self.inner_parallelism = loss.block.program._pipeline_opt[
'inner_parallelism']
assert self.nranks % self.inner_parallelism == 0
pipeline_helper = PipelineHelper(self.role_maker)
pipeline_helper.update_startup_program(
self.startup_program._pipeline_opt["startup_program"],
self.inner_parallelism)
pipeline_num = self.nranks // self.inner_parallelism
self._transpile_main_program(loss, pipeline_num,
self.inner_parallelism)
return optimize_ops, params_grads
def minimize_impl(self,
loss,
startup_program=None,
parameter_list=None,
no_grad_set=None):
self.endpoints = self.role_maker._get_trainer_endpoints()
self.current_endpoint = self.endpoints[self.role_maker._worker_index()]
self.rank = self.role_maker._worker_index()
self.nranks = self.role_maker._worker_num()
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=self.num_microbatches)
orig_startup_program = startup_program if startup_program else fluid.default_startup_program(
)
block = loss.block
program = block.program
program._pipeline_opt = dict()
program._pipeline_opt['local_rank'] = self.rank
program._pipeline_opt['global_ring_id'] = self.global_ring_id
program._pipeline_opt['ring_id'] = self.start_pipeline_ring_id
program._pipeline_opt['micro_batch_size'] = self.micro_batch_size
program._pipeline_opt['schedule_mode'] = self.schedule_mode
program._pipeline_opt['use_sharding'] = False
program._pipeline_opt['mp_degree'] = 1
program._pipeline_opt['mp_rank'] = 0
optimize_ops, params_grads, prog_list, pp_pair, ring_map = self.wrapped_opt.minimize(
loss, startup_program, parameter_list, no_grad_set)
self.startup_program = orig_startup_program._pipeline_opt[
'startup_program']
self.inner_parallelism = program._pipeline_opt['inner_parallelism']
assert self.nranks % self.inner_parallelism == 0
assert prog_list
self.pipeline_num = len(self.endpoints) // self.inner_parallelism
self._init_process_group(pp_pair, ring_map)
self.main_program_list = prog_list
self.main_program = program
if self.pipeline_num > 1:
self._transpile_main_program(loss)
return optimize_ops, params_grads
def get_optimizer_dygraph(self, parameter_list):
optimizer = fluid.optimizer.SGD(learning_rate=0.5,
parameter_list=parameter_list)
optimizer = PipelineOptimizer(optimizer)
return optimizer
class PipelineOptimizer(MetaOptimizerBase):
def __init__(self, optimizer):
super(PipelineOptimizer, self).__init__(optimizer)
self.inner_opt = optimizer
# we do not allow meta optimizer to be inner optimizer currently
self.meta_optimizers_white_list = []
self.meta_optimizers_black_list = []
def _set_basic_info(self, loss, role_maker, user_defined_optimizer,
user_defined_strategy):
super(PipelineOptimizer, self)._set_basic_info(
loss, role_maker, user_defined_optimizer, user_defined_strategy)
self.num_microbatches = user_defined_strategy.pipeline_configs[
'micro_batch']
def _can_apply(self):
if not self.role_maker._is_collective:
return False
if self.user_defined_strategy.pipeline == True:
return True
return False
def _disable_strategy(self, dist_strategy):
dist_strategy.pipeline = False
dist_strategy.pipeline_configs = {}
def _enable_strategy(self, dist_strategy, context):
dist_strategy.pipeline = True
dist_strategy.pipeline_configs = {"micro_batch": 1, }
def _get_local_rank(self, current_endpoint, endpoints):
cur_node_endpoints = []
cur_ip = current_endpoint.split(':')[0].strip()
for ep in endpoints:
if cur_ip == ep.split(':')[0].strip():
cur_node_endpoints.append(ep)
return cur_node_endpoints.index(current_endpoint)
def minimize_impl(self,
loss,
startup_program=None,
parameter_list=None,
no_grad_set=None):
endpoints = self.role_maker._get_trainer_endpoints()
current_endpoint = endpoints[self.role_maker._worker_index()]
self.local_rank = self._get_local_rank(current_endpoint, endpoints)
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=self.num_microbatches,
start_cpu_core_id=self.local_rank)
node_num = _get_node_num(endpoints)
gpus_per_node = len(endpoints) // node_num
self.startup_program = startup_program
self.local_rank = self._get_local_rank(current_endpoint, endpoints)
if startup_program is None:
self.startup_program = fluid.default_startup_program()
loss.block.program._pipeline_opt = dict()
loss.block.program._pipeline_opt['local_rank'] = self.local_rank
optimize_ops, params_grads, prog_list = \
self.wrapped_opt.minimize(loss, startup_program,
parameter_list, no_grad_set)
assert prog_list
self.main_program_list = prog_list
self.main_program = loss.block.program
self.inner_parallelism = loss.block.program._pipeline_opt[
'inner_parallelism']
nranks = len(endpoints)
self.nranks = nranks
self.nrings = len(self.main_program_list)
self.rank = self.role_maker._worker_index()
self.endpoints = endpoints
self.current_endpoint = current_endpoint
pipeline_helper = PipelineHelper(self.role_maker)
pipeline_helper.update_startup_program(
self.startup_program._pipeline_opt["startup_program"],
self.inner_parallelism)
self._transpile_main_program(loss, node_num, gpus_per_node)
return optimize_ops, params_grads
def _transpile_main_program(self, loss, node_num, gpus_per_node):
self._insert_loss_grad_ops(loss, gpus_per_node, node_num)
for ring_id in range(1, gpus_per_node + 1):
self._insert_allreduce_ops(ring_id)
def _insert_loss_grad_ops(self, loss, gpus_per_node, node_num):
"""
In order to keep the learning rate consistent in different numbers of
training workers, we scale the loss grad by the number of workers
"""
block = self.main_program_list[gpus_per_node - 1][
'program'].global_block()
for idx, op in reversed(list(enumerate(block.ops))):
if is_loss_grad_op(op):
loss_grad_var = block.vars[op.output_arg_names[0]]
block._insert_op(
idx + 1,
type='scale',
inputs={'X': loss_grad_var},
outputs={'Out': loss_grad_var},
attrs={
'scale': 1.0 / node_num,
OP_ROLE_KEY: OpRole.Backward
})
def _insert_allreduce_ops(self, ring_id):
block = self.main_program_list[ring_id - 1]['program'].global_block()
origin_block = self.main_program.global_block()
grad = None
for idx, op in reversed(list(enumerate(block.ops))):
if is_backward_op(op) and \
OP_ROLE_VAR_KEY in op.attr_names:
op_role_var = op.all_attrs()[OP_ROLE_VAR_KEY]
if len(op_role_var) == 0:
continue
assert len(op_role_var) % 2 == 0
offset = idx
for i in range(0, len(op_role_var), 2):
param = block.vars[op_role_var[i]]
grad = block.vars[op_role_var[i + 1]]
origin_param = origin_block.vars[op_role_var[i]]
if origin_param.is_distributed:
continue
if offset == idx:
offset += 1
block._insert_op(
offset,
type='c_sync_calc_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={OP_ROLE_KEY: OpRole.Backward})
offset += 1
block._insert_op(
offset,
type='c_sync_calc_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={
'ring_id': ring_id,
OP_ROLE_KEY: OpRole.Backward
})
if grad is None:
return
for idx, op in enumerate(block.ops):
if is_optimizer_op(op):
block._insert_op(
idx + ring_id,
type='c_sync_comm_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={'ring_id': ring_id,
OP_ROLE_KEY: OpRole.Backward})
break
class PipelineOptimizer(MetaOptimizerBase):
def __init__(self, optimizer):
super(PipelineOptimizer, self).__init__(optimizer)
self.inner_opt = optimizer
# we do not allow meta optimizer to be inner optimizer currently
self.meta_optimizers_white_list = []
self.meta_optimizers_black_list = []
def _set_basic_info(self, loss, role_maker, user_defined_optimizer,
user_defined_strategy):
super(PipelineOptimizer,
self)._set_basic_info(loss, role_maker, user_defined_optimizer,
user_defined_strategy)
num_microbatches = user_defined_strategy.pipeline_configs[
'micro_batch']
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=num_microbatches)
def _can_apply(self):
if self.user_defined_strategy.pipeline == True:
return True
return False
def _disable_strategy(self, dist_strategy):
dist_strategy.pipeline = False
dist_strategy.pipeline_configs = {}
def _enable_strategy(self, dist_strategy):
# we do not support enable pipeline automatically right now
return
def minimize_impl(self,
loss,
startup_program=None,
parameter_list=None,
no_grad_set=None):
optimize_ops, params_grads, prog_list = \
self.wrapped_opt.minimize(loss, startup_program,
parameter_list, no_grad_set)
if self.role_maker.worker_num() == 1:
return optimize_ops, params_grads
endpoints = self.role_maker.get_trainer_endpoints()
current_endpoint = endpoints[self.role_maker.worker_index()]
self.startup_program = startup_program
if startup_program is None:
self.startup_program = fluid.default_startup_program()
assert prog_list
self.main_program_list = prog_list
self.main_program = loss.block.program
nranks = len(endpoints)
self.nranks = nranks
self.nrings = len(self.main_program_list)
self.rank = self.role_maker.worker_index()
self.endpoints = endpoints
self.current_endpoint = current_endpoint
pipeline_helper = PipelineHelper(self.role_maker, nrings=self.nrings)
pipeline_helper.update_startup_program(self.startup_program)
self._transpile_main_program()
return optimize_ops, params_grads
def _transpile_main_program(self):
self._insert_loss_grad_ops()
for ring_id in range(self.nrings):
self._insert_allreduce_ops(ring_id)
def _insert_loss_grad_ops(self):
"""
In order to keep the learning rate consistent in different numbers of
training workers, we scale the loss grad by the number of workers
"""
block = self.main_program_list[self.nrings -
1]['program'].global_block()
for idx, op in reversed(list(enumerate(block.ops))):
if is_loss_grad_op(op):
loss_grad_var = block.vars[op.output_arg_names[0]]
block._insert_op(idx + 1,
type='scale',
inputs={'X': loss_grad_var},
outputs={'Out': loss_grad_var},
attrs={
'scale': 1.0 / self.nranks,
OP_ROLE_KEY: OpRole.Backward
})
def _insert_allreduce_ops(self, ring_id):
block = self.main_program_list[ring_id]['program'].global_block()
origin_block = self.main_program.global_block()
grad = None
for idx, op in reversed(list(enumerate(block.ops))):
if is_backward_op(op) and \
OP_ROLE_VAR_KEY in op.attr_names:
op_role_var = op.all_attrs()[OP_ROLE_VAR_KEY]
if len(op_role_var) == 0:
continue
assert len(op_role_var) % 2 == 0
offset = idx
for i in range(0, len(op_role_var), 2):
param = block.vars[op_role_var[i]]
grad = block.vars[op_role_var[i + 1]]
origin_param = origin_block.vars[op_role_var[i]]
if origin_param.is_distributed:
continue
if offset == idx:
offset += 1
block._insert_op(offset,
type='c_sync_calc_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={OP_ROLE_KEY: OpRole.Backward})
offset += 1
block._insert_op(offset,
type='c_sync_calc_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={
'ring_id': ring_id,
OP_ROLE_KEY: OpRole.Backward
})
if grad is None:
return
for idx, op in enumerate(block.ops):
if is_optimizer_op(op):
block._insert_op(idx + ring_id,
type='c_sync_comm_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={
'ring_id': ring_id,
OP_ROLE_KEY: OpRole.Backward
})
break
class PipelineOptimizer(MetaOptimizerBase):
def __init__(self, optimizer):
super(PipelineOptimizer, self).__init__(optimizer)
self.inner_opt = optimizer
# we do not allow meta optimizer to be inner optimizer currently
self.meta_optimizers_white_list = [
"RecomputeOptimizer",
"AMPOptimizer",
]
self.meta_optimizers_black_list = [
"GraphExecutionOptimizer",
]
def _set_basic_info(self, loss, role_maker, user_defined_optimizer,
user_defined_strategy):
super(PipelineOptimizer,
self)._set_basic_info(loss, role_maker, user_defined_optimizer,
user_defined_strategy)
self.micro_batch_size = user_defined_strategy.pipeline_configs[
'micro_batch_size']
self.num_microbatches = user_defined_strategy.pipeline_configs[
'accumulate_steps']
self.schedule_mode = user_defined_strategy.pipeline_configs[
'schedule_mode']
def _can_apply(self):
if not self.role_maker._is_collective:
return False
if self.user_defined_strategy.pipeline == True:
return True
return False
def _disable_strategy(self, dist_strategy):
dist_strategy.pipeline = False
dist_strategy.pipeline_configs = {}
def _enable_strategy(self, dist_strategy, context):
dist_strategy.pipeline = True
dist_strategy.pipeline_configs = {
"micro_batch_size": 1,
"accumulate_steps": 1,
"schedule_mode": "1F1B",
}
def minimize_impl(self,
loss,
startup_program=None,
parameter_list=None,
no_grad_set=None):
endpoints = self.role_maker._get_trainer_endpoints()
current_endpoint = endpoints[self.role_maker._worker_index()]
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=self.num_microbatches)
node_num = _get_node_num(endpoints)
gpus_per_node = len(endpoints) // node_num
self.startup_program = startup_program
if startup_program is None:
self.startup_program = fluid.default_startup_program()
self.rank = self.role_maker._worker_index()
self.nranks = self.role_maker._worker_num()
assert self.nranks % node_num == 0
loss.block.program._pipeline_opt = dict()
loss.block.program._pipeline_opt['local_rank'] = self.rank
loss.block.program._pipeline_opt[
'micro_batch_size'] = self.micro_batch_size
loss.block.program._pipeline_opt['schedule_mode'] = self.schedule_mode
optimize_ops, params_grads, prog_list = self.wrapped_opt.minimize(
loss, startup_program, parameter_list, no_grad_set)
assert prog_list
self.main_program_list = prog_list
self.main_program = loss.block.program
self.inner_parallelism = loss.block.program._pipeline_opt[
'inner_parallelism']
assert self.nranks % self.inner_parallelism == 0
pipeline_helper = PipelineHelper(self.role_maker)
pipeline_helper.update_startup_program(
self.startup_program._pipeline_opt["startup_program"],
self.inner_parallelism)
pipeline_num = self.nranks // self.inner_parallelism
self._transpile_main_program(loss, pipeline_num,
self.inner_parallelism)
return optimize_ops, params_grads
def _transpile_main_program(self, loss, pipeline_num, inner_parallelism):
if pipeline_num <= 1: return
self._insert_loss_grad_ops(loss, pipeline_num)
for ring_id in range(1, inner_parallelism + 1):
self._insert_allreduce_ops(ring_id)
def _insert_loss_grad_ops(self, loss, pipeline_num):
"""
In order to keep the learning rate consistent in different numbers of
training workers, we scale the loss grad by the number of workers
"""
block = self.main_program_list[-1]['program'].global_block()
for idx, op in reversed(list(enumerate(block.ops))):
if is_loss_grad_op(op):
loss_grad_var = block.vars[op.output_arg_names[0]]
block._insert_op(idx + 1,
type='scale',
inputs={'X': loss_grad_var},
outputs={'Out': loss_grad_var},
attrs={
'scale': 1.0 / pipeline_num,
OP_ROLE_KEY: OpRole.Backward
})
def _insert_allreduce_ops(self, ring_id):
block = self.main_program_list[ring_id - 1]['program'].global_block()
origin_block = self.main_program.global_block()
grad = None
processed_param_name = set()
for idx, op in reversed(list(enumerate(block.ops))):
if is_backward_op(op) and \
OP_ROLE_VAR_KEY in op.attr_names:
op_role_var = op.all_attrs()[OP_ROLE_VAR_KEY]
if len(op_role_var) == 0:
continue
assert len(op_role_var) % 2 == 0
offset = idx
for i in range(0, len(op_role_var), 2):
param_name = op_role_var[i]
param = block.vars[op_role_var[i]]
if param_name in processed_param_name: continue
processed_param_name.add(param_name)
grad = block.vars[op_role_var[i + 1]]
origin_param = origin_block.vars[op_role_var[i]]
if origin_param.is_distributed:
continue
if offset == idx:
offset += 1
block._insert_op(offset,
type='c_sync_calc_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={OP_ROLE_KEY: OpRole.Backward})
offset += 1
block._insert_op(offset,
type='c_allreduce_sum',
inputs={'X': grad},
outputs={'Out': grad},
attrs={
'ring_id': ring_id,
OP_ROLE_KEY: OpRole.Backward
})
if grad is None:
return
for idx, op in enumerate(block.ops):
if is_optimizer_op(op):
block._insert_op(idx,
type='c_sync_comm_stream',
inputs={'X': grad},
outputs={'Out': grad},
attrs={
'ring_id': ring_id,
OP_ROLE_KEY: OpRole.Backward
})
break
class PipelineOptimizer(MetaOptimizerBase):
def __init__(self, optimizer):
super(PipelineOptimizer, self).__init__(optimizer)
self.inner_opt = optimizer
self.meta_optimizers_white_list = [
"RecomputeOptimizer",
"AMPOptimizer",
]
self.meta_optimizers_black_list = [
"GraphExecutionOptimizer",
]
self.global_ring_id = 1
self.dp_ring_id = 2
self.start_pipeline_ring_id = 20 # Just a magic number
def _set_basic_info(self, loss, role_maker, user_defined_optimizer,
user_defined_strategy):
super(PipelineOptimizer,
self)._set_basic_info(loss, role_maker, user_defined_optimizer,
user_defined_strategy)
self.micro_batch_size = user_defined_strategy.pipeline_configs[
'micro_batch_size']
self.num_microbatches = user_defined_strategy.pipeline_configs[
'accumulate_steps']
self.schedule_mode = user_defined_strategy.pipeline_configs[
'schedule_mode']
self.use_sharding = user_defined_strategy.sharding
def _can_apply(self):
if not self.role_maker._is_collective:
return False
# FIXME revise for hybrid parallelism
if self.use_sharding:
return False
if self.user_defined_strategy.pipeline == True:
return True
return False
def _disable_strategy(self, dist_strategy):
dist_strategy.pipeline = False
dist_strategy.pipeline_configs = {
"micro_batch_size": 1,
"accumulate_steps": 1,
"schedule_mode": "1F1B",
}
def _enable_strategy(self, dist_strategy, context):
dist_strategy.pipeline = True
dist_strategy.pipeline_configs = {
"micro_batch_size": 1,
"accumulate_steps": 1,
"schedule_mode": "1F1B",
}
def _broadcast_params(self, ring_id):
block = self.startup_program.global_block()
param = None
for param in block.iter_parameters():
if param.is_distributed:
continue
block.append_op(type='c_broadcast',
inputs={'X': param},
outputs={'Out': param},
attrs={
'ring_id': ring_id,
'root': 0,
OP_ROLE_KEY: OpRole.Forward
})
if not param: return # no parameter on this device
block.append_op(type='c_sync_comm_stream',
inputs={'X': param},
outputs={'Out': param},
attrs={
'ring_id': ring_id,
OP_ROLE_KEY: OpRole.Forward
})
def _get_process_group_info(self):
# global ring info
self.global_endpoints = self.endpoints
self.global_rank = self.rank
self.global_nranks = self.nranks
# data parallel ring info
if self.pipeline_num > 1:
self.dp_rank = self.rank // self.inner_parallelism
self.dp_nranks = self.nranks // self.inner_parallelism
start_index = self.rank % self.inner_parallelism
self.dp_endpoints = [
self.endpoints[start_index + i * self.inner_parallelism]
for i in range(self.pipeline_num)
]
def _init_process_group(self, pipeline_pair, pipeline_ring_map):
self._get_process_group_info()
collective_helper = CollectiveHelper(self.role_maker, wait_port=False)
# Create global ring for all gpus (ring_id = 0)
collective_helper._init_communicator(self.startup_program,
self.current_endpoint,
self.global_endpoints,
self.global_rank,
self.global_ring_id, True,
self.global_ring_id, True)
# Create pipeline rings
if self.inner_parallelism > 1:
pipeline_id = self.rank // self.inner_parallelism
start_index = pipeline_id * self.inner_parallelism
for pair in pipeline_pair:
pair_key = pair[0] * 1000 + pair[1]
ring_id = pipeline_ring_map[pair_key]
assert ring_id >= self.start_pipeline_ring_id
first_node = pair[0] + start_index
second_node = pair[1] + start_index
if self.rank != first_node and self.rank != second_node:
collective_helper._init_communicator(
self.startup_program, None, None, None, None, False,
self.global_ring_id, True)
continue
pipeline_endpoints = [
self.endpoints[first_node], self.endpoints[second_node]
]
pipeline_rank = 0 if self.rank == first_node else 1
pipeline_nranks = 2
collective_helper._init_communicator(self.startup_program,
self.current_endpoint,
pipeline_endpoints,
pipeline_rank, ring_id,
False,
self.global_ring_id, True)
# Create dp rings
if self.pipeline_num > 1:
collective_helper._init_communicator(
self.startup_program, self.current_endpoint, self.dp_endpoints,
self.dp_rank, self.dp_ring_id, True, self.global_ring_id, True)
self._broadcast_params(self.dp_ring_id)
def minimize_impl(self,
loss,
startup_program=None,
parameter_list=None,
no_grad_set=None):
self.endpoints = self.role_maker._get_trainer_endpoints()
self.current_endpoint = self.endpoints[self.role_maker._worker_index()]
self.rank = self.role_maker._worker_index()
self.nranks = self.role_maker._worker_num()
self.wrapped_opt = PO(self.inner_opt,
num_microbatches=self.num_microbatches)
orig_startup_program = startup_program if startup_program else fluid.default_startup_program(
)
block = loss.block
program = block.program
program._pipeline_opt = dict()
program._pipeline_opt['local_rank'] = self.rank
program._pipeline_opt['global_ring_id'] = self.global_ring_id
program._pipeline_opt['ring_id'] = self.start_pipeline_ring_id
program._pipeline_opt['micro_batch_size'] = self.micro_batch_size
program._pipeline_opt['schedule_mode'] = self.schedule_mode
program._pipeline_opt['use_sharding'] = False
program._pipeline_opt['mp_degree'] = 1
program._pipeline_opt['mp_rank'] = 0
optimize_ops, params_grads, prog_list, pp_pair, ring_map = self.wrapped_opt.minimize(
loss, startup_program, parameter_list, no_grad_set)
self.startup_program = orig_startup_program._pipeline_opt[
'startup_program']
self.inner_parallelism = program._pipeline_opt['inner_parallelism']
assert self.nranks % self.inner_parallelism == 0
assert prog_list
self.pipeline_num = len(self.endpoints) // self.inner_parallelism
self._init_process_group(pp_pair, ring_map)
self.main_program_list = prog_list
self.main_program = program
if self.pipeline_num > 1:
self._transpile_main_program(loss)
return optimize_ops, params_grads
def _transpile_main_program(self, loss):
self._insert_loss_grad_ops(loss, self.pipeline_num)
self._insert_allreduce_ops(self.dp_ring_id)
def _insert_loss_grad_ops(self, loss, pipeline_num):
"""
In order to keep the learning rate consistent in different numbers of
training workers, we scale the loss grad by the number of workers
"""
block = self.main_program_list[-1].global_block()
for idx, op in reversed(list(enumerate(block.ops))):
if is_loss_grad_op(op):
loss_grad_var = block.vars[op.output_arg_names[0]]
block._insert_op(idx + 1,
type='scale',
inputs={'X': loss_grad_var},
outputs={'Out': loss_grad_var},
attrs={
'scale': 1.0 / pipeline_num,
OP_ROLE_KEY: OpRole.Backward
})
def _insert_allreduce_ops(self, ring_id):
block = self.main_program._pipeline_opt[
'section_program'].global_block()
origin_block = self.main_program.global_block()
grad = None
processed_param_name = set()
first_optimize_op_idx = None
for idx, op in reversed(list(enumerate(block.ops))):
if is_backward_op(op) and not first_optimize_op_idx:
first_optimize_op_idx = idx + 1
# no optimize phase
if first_optimize_op_idx == len(block.ops): return
if is_backward_op(op) and \
OP_ROLE_VAR_KEY in op.attr_names:
op_role_var = op.all_attrs()[OP_ROLE_VAR_KEY]
if len(op_role_var) == 0:
continue
assert len(op_role_var) % 2 == 0
offset = 0
for i in range(0, len(op_role_var), 2):
param_name = op_role_var[i]
param = block.vars[op_role_var[i]]
if param_name in processed_param_name: continue
processed_param_name.add(param_name)
grad_name = op_role_var[i + 1]
if not 'MERGED' in grad_name: grad_name += '@MERGED'
grad = block.vars[grad_name]
origin_param = origin_block.vars[op_role_var[i]]
if origin_param.is_distributed:
continue
block._insert_op(first_optimize_op_idx + offset,
type='c_allreduce_sum',
inputs={'X': grad},
outputs={'Out': grad},
attrs={
'ring_id': ring_id,
'use_calc_stream': True,
OP_ROLE_KEY: OpRole.Optimize
})