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121 lines
4.3 KiB
121 lines
4.3 KiB
from time import time
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from typing import Optional
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import torch
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import torch.distributed as dist
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from torch import Tensor
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from colossalai.accelerator import get_accelerator
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from colossalai.cluster import DistCoordinator
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def divide(x: float, y: float) -> float:
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if y == 0:
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return float("inf")
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elif y == float("inf"):
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return float("nan")
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return x / y
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@torch.no_grad()
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def all_reduce_mean(x: float, world_size: int) -> float:
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if world_size == 1:
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return x
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tensor = torch.tensor([x], device=get_accelerator().get_current_device())
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dist.all_reduce(tensor)
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tensor = tensor / world_size
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return tensor.item()
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class Timer:
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def __init__(self) -> None:
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self.start_time: Optional[float] = None
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self.duration: float = 0.0
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def start(self) -> None:
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self.start_time = time()
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def end(self) -> None:
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assert self.start_time is not None
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self.duration += time() - self.start_time
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self.start_time = None
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def reset(self) -> None:
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self.duration = 0.0
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class PerformanceEvaluator:
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"""
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Callback for valuate the performance of the model.
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Args:
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actor_num_params: The number of parameters of the actor model.
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critic_num_params: The number of parameters of the critic model.
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initial_model_num_params: The number of parameters of the initial model.
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reward_model_num_params: The number of parameters of the reward model.
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enable_grad_checkpoint: Whether to enable gradient checkpointing.
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ignore_episodes: The number of episodes to ignore when calculating the performance.
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"""
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def __init__(
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self,
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model_numel: int,
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num_layers: int,
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hidden_size: int,
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vocab_size: int,
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enable_grad_checkpoint: bool = False,
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ignore_steps: int = 0,
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dp_world_size: Optional[int] = None,
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) -> None:
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self.model_numel = model_numel
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self.enable_grad_checkpoint = enable_grad_checkpoint
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self.ignore_steps = ignore_steps
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self.num_layers = num_layers
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self.hidden_size = hidden_size
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self.vocab_size = vocab_size
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self.coordinator = DistCoordinator()
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self.dp_world_size = dp_world_size or self.coordinator.world_size
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self.disable: bool = False
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self.timer = Timer()
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self.num_samples: int = 0
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self.flop_megatron = 0
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self.flop: int = 0
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def on_step_start(self, step: int) -> None:
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self.disable = self.ignore_steps > 0 and step < self.ignore_steps
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if self.disable:
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return
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get_accelerator().synchronize()
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self.timer.start()
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def on_step_end(self, input_ids: Tensor, **kwargs) -> None:
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if self.disable:
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return
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get_accelerator().synchronize()
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self.timer.end()
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batch_size, seq_len = input_ids.shape
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self.num_samples += batch_size
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checkpoint_activations_factor = 3 + int(self.enable_grad_checkpoint)
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self.flop_megatron += (
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24 * checkpoint_activations_factor * batch_size * seq_len * self.num_layers * (self.hidden_size**2)
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) * (
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1.0 + (seq_len / (6.0 * self.hidden_size)) + (self.vocab_size / (16.0 * self.num_layers * self.hidden_size))
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)
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self.flop += batch_size * seq_len * self.model_numel * 2 * (3 + int(self.enable_grad_checkpoint))
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def on_fit_end(self) -> None:
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avg_duration = all_reduce_mean(self.timer.duration, self.coordinator.world_size)
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avg_throughput = self.num_samples * self.dp_world_size / (avg_duration + 1e-12)
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mp_world_size = self.coordinator.world_size // self.dp_world_size
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avg_tflops_per_gpu_megatron = self.flop_megatron / 1e12 / (avg_duration + 1e-12) / mp_world_size
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avg_tflops_per_gpu = self.flop / 1e12 / (avg_duration + 1e-12) / mp_world_size
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self.coordinator.print_on_master(
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f"num_samples: {self.num_samples}, dp_world_size: {self.dp_world_size}, flop_megatron: {self.flop_megatron}, flop: {self.flop}, avg_duration: {avg_duration}, "
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f"avg_throughput: {avg_throughput}"
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)
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self.coordinator.print_on_master(
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f"Throughput: {avg_throughput:.2f} samples/sec, TFLOPS per GPU by Megatron: {avg_tflops_per_gpu_megatron:.2f}, TFLOPS per GPU: {avg_tflops_per_gpu:.2f}"
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)
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