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# Copyright 2024 Bytedance Ltd. and/or its affiliates
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import time
import torch
import torch.distributed as dist
def _megatron_calc_layer_map(config):
"""Calculate the mapping of global layer_idx to local layer_idx
Returns:
layer_map (Dict: int -> tuple(int, int, int)):
mapping from the global layer index to
a tuple of (pp_rank, virtual_pp_rank, layer_idx inside model)
"""
from megatron.core import mpu
pp_size = mpu.get_pipeline_model_parallel_world_size()
virtual_pp_size = mpu.get_virtual_pipeline_model_parallel_world_size() or 1
layer_map = dict()
num_layers_per_model = config.num_hidden_layers // pp_size // virtual_pp_size
assert num_layers_per_model * pp_size * virtual_pp_size == config.num_hidden_layers
for pp_rank_idx in range(pp_size):
for virtual_pp_rank_idx in range(virtual_pp_size):
layer_offset = virtual_pp_rank_idx * (config.num_hidden_layers // virtual_pp_size) + pp_rank_idx * num_layers_per_model
for layer_idx in range(num_layers_per_model):
layer_map[layer_offset + layer_idx] = (
pp_rank_idx,
virtual_pp_rank_idx,
layer_idx,
)
return layer_map
def load_state_dict_to_megatron_qwen2(state_dict, wrapped_models, config, params_dtype, is_value_model=False, tie_word_embeddings=False):
"""Load merged state_dict to sharded Megatron module in training."""
from megatron.core import DistributedDataParallel as LocalDDP
from megatron.core import mpu
from megatron.core.transformer.module import Float16Module
from torch.nn.parallel import DistributedDataParallel as torchDDP
from verl.utils.megatron_utils import print_rank_0, unwrap_model
start_time = time.time()
def _get_gpt_model(model):
return model
def fetch_params(module):
for param in module.parameters():
torch.distributed.fetch(param.data, src=mpu.get_data_parallel_src_rank(), group=mpu.get_data_parallel_group())
dp_rank = mpu.get_data_parallel_rank()
pp_rank = mpu.get_pipeline_model_parallel_rank()
pp_size = mpu.get_pipeline_model_parallel_world_size()
virtual_pp_size = mpu.get_virtual_pipeline_model_parallel_world_size() or 1
mp_group = mpu.get_model_parallel_group()
if torch.distributed.get_rank() == 0:
assert mp_group.rank() == 0, f"mp_rank:[{mp_group.rank}] != 0 on rank #0"
assert pp_rank == 0, f"pp_rank:[{pp_rank}] != 0 on rank #0"
assert dp_rank == 0, f"dp_rank:[{dp_rank}] != 0 on rank #0"
if not isinstance(wrapped_models, (list, tuple)):
wrapped_models = list(wrapped_models)
assert len(wrapped_models) == virtual_pp_size
num_layers_per_model = config.num_hidden_layers // pp_size // virtual_pp_size
assert num_layers_per_model * pp_size * virtual_pp_size == config.num_hidden_layers, f"num_layers_per_model: {num_layers_per_model} * pp_size: {pp_size} * virtual_pp_size: {virtual_pp_size} != config.num_hidden_layers: {config.num_hidden_layers}"
models = [None] * len(wrapped_models)
for i, wrapped_model in enumerate(wrapped_models):
models[i] = unwrap_model(wrapped_model, (torchDDP, LocalDDP, Float16Module))
gpt_model_module = _get_gpt_model(models[i])
assert len(gpt_model_module.model.layers) == num_layers_per_model
def _fetch_tensor(tensor, name) -> torch.Tensor:
"""fetch tensor"""
nonlocal state_dict
if tensor is not None:
tensor = tensor.data.copy_(state_dict[name], non_blocking=True)
def _fetch_tp_shard_tensor_vocab(tensor, name, chunk_dim=0, mutate_func=None) -> torch.Tensor:
"""fetch tensor in tp shards"""
nonlocal state_dict
tp_rank = mpu.get_tensor_model_parallel_rank()
tp_size = mpu.get_tensor_model_parallel_world_size()
if name in state_dict:
full_weight = state_dict[name]
if mutate_func is not None:
full_weight = mutate_func(full_weight)
tensor_chunk = torch.chunk(full_weight, tp_size, dim=chunk_dim)
if tensor is not None:
tensor = tensor.data.copy_(tensor_chunk[tp_rank], non_blocking=True)
else:
print(f"tp_shard tensor:[{name}] not in state_dict, skip loading")
def _fetch_tp_shard_tensor(tensor, name, chunk_dim=0, mutate_func=None) -> torch.Tensor:
"""fetch tensor in tp shards"""
nonlocal state_dict
tp_rank = mpu.get_tensor_model_parallel_rank()
tp_size = mpu.get_tensor_model_parallel_world_size()
if name in state_dict:
full_weight = state_dict[name]
if mutate_func is not None:
full_weight = mutate_func(full_weight)
tensor_chunk = torch.chunk(full_weight, tp_size, dim=chunk_dim)
if tensor is not None:
tensor = tensor.data.copy_(tensor_chunk[tp_rank], non_blocking=True)
else:
print(f"tp_shard tensor:[{name}] not in state_dict, skip loading")
def _fetch_tp_shard_tensor_gate_up(tensor, gate_name, up_name) -> torch.Tensor:
"""fetch gate_up tensor in tp shards"""
nonlocal state_dict
nonlocal mp_group
tp_rank = mpu.get_tensor_model_parallel_rank()
tp_size = mpu.get_tensor_model_parallel_world_size()
if gate_name in state_dict and up_name in state_dict:
gate_weight = state_dict[gate_name]
up_weight = state_dict[up_name]
new_gate_up_weight = torch.empty(config.intermediate_size * 2, config.hidden_size, dtype=params_dtype, device=torch.cuda.current_device())
for i in range(tp_size):
intermediate_size_tp = config.intermediate_size // tp_size
gate_weight_tp = gate_weight[i * intermediate_size_tp : (i + 1) * intermediate_size_tp]
up_weight_tp = up_weight[i * intermediate_size_tp : (i + 1) * intermediate_size_tp]
new_gate_up_weight[intermediate_size_tp * 2 * i : intermediate_size_tp * 2 * (i + 1)].copy_(torch.cat([gate_weight_tp, up_weight_tp], dim=0))
tensor_chunk = torch.chunk(new_gate_up_weight, tp_size, dim=0)
if tensor is not None:
tensor = tensor.data.copy_(tensor_chunk[tp_rank], non_blocking=True)
else:
print(f"tp_shard tensor:[{gate_name}, {up_name}] not in state_dict, skip loading")
def _fetch_tp_shard_tensor_qkv(tensor, q_name, k_name, v_name, bias=False) -> torch.Tensor:
"""fetch tensor in tp shards across mp_group"""
nonlocal state_dict
nonlocal mp_group
tp_rank = mpu.get_tensor_model_parallel_rank()
tp_size = mpu.get_tensor_model_parallel_world_size()
assert q_name in state_dict and k_name in state_dict and v_name in state_dict
full_weight_q = state_dict[q_name]
full_weight_k = state_dict[k_name]
full_weight_v = state_dict[v_name]
hidden_size_per_head = config.hidden_size // config.num_attention_heads
if config.num_key_value_heads >= tp_size:
q_size_tp = config.hidden_size // tp_size
kv_size_tp = hidden_size_per_head * config.num_key_value_heads // tp_size
total_size = q_size_tp + 2 * kv_size_tp
if not bias:
new_weight_qkv = torch.empty(total_size * tp_size, config.hidden_size, dtype=params_dtype, device=torch.cuda.current_device())
else:
new_weight_qkv = torch.empty(total_size * tp_size, dtype=params_dtype, device=torch.cuda.current_device())
for i in range(tp_size):
q_part = full_weight_q[i * q_size_tp : (i + 1) * q_size_tp]
k_part = full_weight_k[i * kv_size_tp : (i + 1) * kv_size_tp]
v_part = full_weight_v[i * kv_size_tp : (i + 1) * kv_size_tp]
new_weight_qkv[i * total_size : (i + 1) * total_size].copy_(torch.cat([q_part, k_part, v_part], dim=0))
else:
q_size_tp = config.hidden_size // tp_size
kv_size_tp = hidden_size_per_head
total_size = q_size_tp + 2 * kv_size_tp
if not bias:
new_weight_qkv = torch.empty(total_size * tp_size, config.hidden_size, dtype=params_dtype, device=torch.cuda.current_device())
else:
new_weight_qkv = torch.empty(total_size * tp_size, dtype=params_dtype, device=torch.cuda.current_device())
for i in range(tp_size):
q_part = full_weight_q[i * q_size_tp : (i + 1) * q_size_tp]
start_idx = i * config.num_key_value_heads // tp_size * hidden_size_per_head
end_idx = (i * config.num_key_value_heads // tp_size + 1) * hidden_size_per_head
k_part = full_weight_k[start_idx:end_idx]
v_part = full_weight_v[start_idx:end_idx]
new_weight_qkv[i * total_size : (i + 1) * total_size].copy_(torch.cat([q_part, k_part, v_part], dim=0))
tensor_chunk = torch.chunk(new_weight_qkv, tp_size, dim=0)
if tensor is not None:
tensor = tensor.data.copy_(tensor_chunk[tp_rank], non_blocking=True)
# Embeddings
# -------------------
print_rank_0("loading embeddings...")
gpt_model_module = _get_gpt_model(models[0])
if pp_rank == 0:
embed_tokens_weight = gpt_model_module.model.embed_tokens.weight
_fetch_tp_shard_tensor_vocab(embed_tokens_weight, "model.embed_tokens.weight")
# Transformer layers
# -------------------
layer_map = _megatron_calc_layer_map(config)
pp_rank = mpu.get_pipeline_model_parallel_rank()
pp_size = mpu.get_pipeline_model_parallel_world_size()
num_layer_per_pp = config.num_hidden_layers // pp_size
vpp_size = mpu.get_virtual_pipeline_model_parallel_world_size()
layer_list = []
if vpp_size is not None:
for vpp_rank in range(vpp_size):
num_layer_vpp_chunk = num_layer_per_pp // vpp_size
num_layer_this_model = num_layer_vpp_chunk
offset = vpp_rank * (config.num_hidden_layers // mpu.get_virtual_pipeline_model_parallel_world_size()) + (mpu.get_pipeline_model_parallel_rank() * num_layer_vpp_chunk)
layer_list.extend(list(range(offset, offset + num_layer_this_model)))
else:
num_layer_this_model = num_layer_per_pp
offset = pp_rank * num_layer_per_pp
layer_list.extend(list(range(offset, offset + num_layer_this_model)))
for layer in layer_list:
print(f"{torch.distributed.get_rank()} loading layer #{layer}...")
layer_name = f"model.layers.{layer}"
dst_pp_rank, dst_virtual_pp_rank, dst_layer_idx = layer_map[layer]
print(f"{torch.distributed.get_rank()} offset: {offset}, num_layer_this_model: {num_layer_this_model}, layer_name: {layer_name}, layer_map[layer]: {layer_map[layer]}")
gpt_model_module = _get_gpt_model(models[dst_virtual_pp_rank])
sync_layer = gpt_model_module.model.layers[dst_layer_idx]
_fetch_tensor(
sync_layer.input_layernorm.weight if dst_pp_rank == pp_rank else None,
f"{layer_name}.input_layernorm.weight",
)
_fetch_tp_shard_tensor_qkv(
sync_layer.self_attn.qkv_proj.weight if dst_pp_rank == pp_rank else None,
f"{layer_name}.self_attn.q_proj.weight",
f"{layer_name}.self_attn.k_proj.weight",
f"{layer_name}.self_attn.v_proj.weight",
)
_fetch_tp_shard_tensor_qkv(
sync_layer.self_attn.qkv_proj.bias if dst_pp_rank == pp_rank else None,
f"{layer_name}.self_attn.q_proj.bias",
f"{layer_name}.self_attn.k_proj.bias",
f"{layer_name}.self_attn.v_proj.bias",
bias=True,
)
_fetch_tp_shard_tensor(
sync_layer.self_attn.o_proj.weight if dst_pp_rank == pp_rank else None,
f"{layer_name}.self_attn.o_proj.weight",
chunk_dim=1,
)
_fetch_tensor(
sync_layer.post_attention_layernorm.weight if dst_pp_rank == pp_rank else None,
f"{layer_name}.post_attention_layernorm.weight",
)
_fetch_tp_shard_tensor_gate_up(
sync_layer.mlp.gate_up_proj.weight if dst_pp_rank == pp_rank else None,
f"{layer_name}.mlp.gate_proj.weight",
f"{layer_name}.mlp.up_proj.weight",
)
_fetch_tp_shard_tensor(
sync_layer.mlp.down_proj.weight if dst_pp_rank == pp_rank else None,
f"{layer_name}.mlp.down_proj.weight",
chunk_dim=1,
)
# Final Layernorm
# -------------------
print_rank_0("loading final layernorm...")
gpt_model_module = _get_gpt_model(models[-1])
_fetch_tensor(
getattr(gpt_model_module.model.norm, "weight", None),
"model.norm.weight",
)
if tie_word_embeddings:
print_rank_0("tie_word_embeddings skip load lm_head")
else:
print_rank_0("loading lm_head...")
if pp_rank + 1 == pp_size:
lm_head_weight = gpt_model_module.lm_head.weight
if is_value_model:
if "lm_head.weight" in state_dict and state_dict["lm_head.weight"].shape[0] == 1:
_fetch_tensor(lm_head_weight, "lm_head.weight")
print_rank_0("load lm_head from value_head weight")
elif "reward_head.weight" in state_dict and state_dict["reward_head.weight"].shape[0] == 1:
_fetch_tensor(lm_head_weight, "reward_head.weight")
print_rank_0("load lm_head from value_head weight")
else:
_fetch_tensor(None, "lm_head.weight")
print_rank_0("fail to match lm_head in value_model")
else:
_fetch_tp_shard_tensor(lm_head_weight, "lm_head.weight")
dist.barrier()
torch.cuda.empty_cache()
print_rank_0(f"loading megatron ckpt done, time elapsed {time.time() - start_time}s")
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