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# Ultralytics YOLO 🚀, AGPL-3.0 license |
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import math |
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import os |
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import platform |
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import random |
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import time |
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from contextlib import contextmanager |
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from copy import deepcopy |
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from pathlib import Path |
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from typing import Union |
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import numpy as np |
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import torch |
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import torch.distributed as dist |
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import torch.nn as nn |
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import torch.nn.functional as F |
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import torchvision |
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from ultralytics.utils import DEFAULT_CFG_DICT, DEFAULT_CFG_KEYS, LOGGER, __version__ |
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from ultralytics.utils.checks import check_version |
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try: |
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import thop |
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except ImportError: |
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thop = None |
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TORCH_1_9 = check_version(torch.__version__, "1.9.0") |
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TORCH_2_0 = check_version(torch.__version__, "2.0.0") |
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TORCHVISION_0_10 = check_version(torchvision.__version__, "0.10.0") |
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TORCHVISION_0_11 = check_version(torchvision.__version__, "0.11.0") |
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TORCHVISION_0_13 = check_version(torchvision.__version__, "0.13.0") |
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@contextmanager |
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def torch_distributed_zero_first(local_rank: int): |
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"""Decorator to make all processes in distributed training wait for each local_master to do something.""" |
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initialized = torch.distributed.is_available() and torch.distributed.is_initialized() |
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if initialized and local_rank not in (-1, 0): |
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dist.barrier(device_ids=[local_rank]) |
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yield |
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if initialized and local_rank == 0: |
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dist.barrier(device_ids=[0]) |
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def smart_inference_mode(): |
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"""Applies torch.inference_mode() decorator if torch>=1.9.0 else torch.no_grad() decorator.""" |
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def decorate(fn): |
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"""Applies appropriate torch decorator for inference mode based on torch version.""" |
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if TORCH_1_9 and torch.is_inference_mode_enabled(): |
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return fn # already in inference_mode, act as a pass-through |
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else: |
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return (torch.inference_mode if TORCH_1_9 else torch.no_grad)()(fn) |
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return decorate |
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def get_cpu_info(): |
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"""Return a string with system CPU information, i.e. 'Apple M2'.""" |
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import cpuinfo # pip install py-cpuinfo |
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k = "brand_raw", "hardware_raw", "arch_string_raw" # info keys sorted by preference (not all keys always available) |
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info = cpuinfo.get_cpu_info() # info dict |
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string = info.get(k[0] if k[0] in info else k[1] if k[1] in info else k[2], "unknown") |
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return string.replace("(R)", "").replace("CPU ", "").replace("@ ", "") |
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def select_device(device="", batch=0, newline=False, verbose=True): |
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""" |
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Selects the appropriate PyTorch device based on the provided arguments. |
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The function takes a string specifying the device or a torch.device object and returns a torch.device object |
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representing the selected device. The function also validates the number of available devices and raises an |
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exception if the requested device(s) are not available. |
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Args: |
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device (str | torch.device, optional): Device string or torch.device object. |
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Options are 'None', 'cpu', or 'cuda', or '0' or '0,1,2,3'. Defaults to an empty string, which auto-selects |
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the first available GPU, or CPU if no GPU is available. |
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batch (int, optional): Batch size being used in your model. Defaults to 0. |
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newline (bool, optional): If True, adds a newline at the end of the log string. Defaults to False. |
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verbose (bool, optional): If True, logs the device information. Defaults to True. |
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Returns: |
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(torch.device): Selected device. |
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Raises: |
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ValueError: If the specified device is not available or if the batch size is not a multiple of the number of |
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devices when using multiple GPUs. |
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Examples: |
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>>> select_device('cuda:0') |
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device(type='cuda', index=0) |
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>>> select_device('cpu') |
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device(type='cpu') |
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Note: |
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Sets the 'CUDA_VISIBLE_DEVICES' environment variable for specifying which GPUs to use. |
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""" |
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if isinstance(device, torch.device): |
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return device |
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s = f"Ultralytics YOLOv{__version__} 🚀 Python-{platform.python_version()} torch-{torch.__version__} " |
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device = str(device).lower() |
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for remove in "cuda:", "none", "(", ")", "[", "]", "'", " ": |
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device = device.replace(remove, "") # to string, 'cuda:0' -> '0' and '(0, 1)' -> '0,1' |
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cpu = device == "cpu" |
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mps = device in ("mps", "mps:0") # Apple Metal Performance Shaders (MPS) |
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if cpu or mps: |
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os.environ["CUDA_VISIBLE_DEVICES"] = "-1" # force torch.cuda.is_available() = False |
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elif device: # non-cpu device requested |
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if device == "cuda": |
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device = "0" |
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visible = os.environ.get("CUDA_VISIBLE_DEVICES", None) |
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os.environ["CUDA_VISIBLE_DEVICES"] = device # set environment variable - must be before assert is_available() |
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if not (torch.cuda.is_available() and torch.cuda.device_count() >= len(device.replace(",", ""))): |
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LOGGER.info(s) |
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install = ( |
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"See https://pytorch.org/get-started/locally/ for up-to-date torch install instructions if no " |
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"CUDA devices are seen by torch.\n" |
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if torch.cuda.device_count() == 0 |
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else "" |
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) |
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raise ValueError( |
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f"Invalid CUDA 'device={device}' requested." |
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f" Use 'device=cpu' or pass valid CUDA device(s) if available," |
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f" i.e. 'device=0' or 'device=0,1,2,3' for Multi-GPU.\n" |
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f"\ntorch.cuda.is_available(): {torch.cuda.is_available()}" |
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f"\ntorch.cuda.device_count(): {torch.cuda.device_count()}" |
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f"\nos.environ['CUDA_VISIBLE_DEVICES']: {visible}\n" |
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f"{install}" |
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) |
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if not cpu and not mps and torch.cuda.is_available(): # prefer GPU if available |
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devices = device.split(",") if device else "0" # range(torch.cuda.device_count()) # i.e. 0,1,6,7 |
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n = len(devices) # device count |
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if n > 1 and batch > 0 and batch % n != 0: # check batch_size is divisible by device_count |
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raise ValueError( |
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f"'batch={batch}' must be a multiple of GPU count {n}. Try 'batch={batch // n * n}' or " |
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f"'batch={batch // n * n + n}', the nearest batch sizes evenly divisible by {n}." |
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) |
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space = " " * (len(s) + 1) |
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for i, d in enumerate(devices): |
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p = torch.cuda.get_device_properties(i) |
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s += f"{'' if i == 0 else space}CUDA:{d} ({p.name}, {p.total_memory / (1 << 20):.0f}MiB)\n" # bytes to MB |
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arg = "cuda:0" |
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elif mps and TORCH_2_0 and torch.backends.mps.is_available(): |
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# Prefer MPS if available |
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s += f"MPS ({get_cpu_info()})\n" |
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arg = "mps" |
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else: # revert to CPU |
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s += f"CPU ({get_cpu_info()})\n" |
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arg = "cpu" |
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if verbose: |
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LOGGER.info(s if newline else s.rstrip()) |
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return torch.device(arg) |
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def time_sync(): |
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"""PyTorch-accurate time.""" |
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if torch.cuda.is_available(): |
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torch.cuda.synchronize() |
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return time.time() |
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def fuse_conv_and_bn(conv, bn): |
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"""Fuse Conv2d() and BatchNorm2d() layers https://tehnokv.com/posts/fusing-batchnorm-and-conv/.""" |
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fusedconv = ( |
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nn.Conv2d( |
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conv.in_channels, |
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conv.out_channels, |
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kernel_size=conv.kernel_size, |
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stride=conv.stride, |
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padding=conv.padding, |
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dilation=conv.dilation, |
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groups=conv.groups, |
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bias=True, |
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) |
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.requires_grad_(False) |
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.to(conv.weight.device) |
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) |
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# Prepare filters |
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w_conv = conv.weight.clone().view(conv.out_channels, -1) |
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w_bn = torch.diag(bn.weight.div(torch.sqrt(bn.eps + bn.running_var))) |
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fusedconv.weight.copy_(torch.mm(w_bn, w_conv).view(fusedconv.weight.shape)) |
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# Prepare spatial bias |
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b_conv = torch.zeros(conv.weight.size(0), device=conv.weight.device) if conv.bias is None else conv.bias |
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b_bn = bn.bias - bn.weight.mul(bn.running_mean).div(torch.sqrt(bn.running_var + bn.eps)) |
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fusedconv.bias.copy_(torch.mm(w_bn, b_conv.reshape(-1, 1)).reshape(-1) + b_bn) |
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return fusedconv |
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def fuse_deconv_and_bn(deconv, bn): |
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"""Fuse ConvTranspose2d() and BatchNorm2d() layers.""" |
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fuseddconv = ( |
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nn.ConvTranspose2d( |
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deconv.in_channels, |
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deconv.out_channels, |
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kernel_size=deconv.kernel_size, |
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stride=deconv.stride, |
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padding=deconv.padding, |
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output_padding=deconv.output_padding, |
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dilation=deconv.dilation, |
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groups=deconv.groups, |
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bias=True, |
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) |
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.requires_grad_(False) |
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.to(deconv.weight.device) |
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) |
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# Prepare filters |
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w_deconv = deconv.weight.clone().view(deconv.out_channels, -1) |
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w_bn = torch.diag(bn.weight.div(torch.sqrt(bn.eps + bn.running_var))) |
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fuseddconv.weight.copy_(torch.mm(w_bn, w_deconv).view(fuseddconv.weight.shape)) |
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# Prepare spatial bias |
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b_conv = torch.zeros(deconv.weight.size(1), device=deconv.weight.device) if deconv.bias is None else deconv.bias |
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b_bn = bn.bias - bn.weight.mul(bn.running_mean).div(torch.sqrt(bn.running_var + bn.eps)) |
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fuseddconv.bias.copy_(torch.mm(w_bn, b_conv.reshape(-1, 1)).reshape(-1) + b_bn) |
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return fuseddconv |
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def model_info(model, detailed=False, verbose=True, imgsz=640): |
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""" |
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Model information. |
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imgsz may be int or list, i.e. imgsz=640 or imgsz=[640, 320]. |
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""" |
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if not verbose: |
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return |
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n_p = get_num_params(model) # number of parameters |
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n_g = get_num_gradients(model) # number of gradients |
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n_l = len(list(model.modules())) # number of layers |
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if detailed: |
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LOGGER.info( |
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f"{'layer':>5} {'name':>40} {'gradient':>9} {'parameters':>12} {'shape':>20} {'mu':>10} {'sigma':>10}" |
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) |
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for i, (name, p) in enumerate(model.named_parameters()): |
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name = name.replace("module_list.", "") |
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LOGGER.info( |
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"%5g %40s %9s %12g %20s %10.3g %10.3g %10s" |
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% (i, name, p.requires_grad, p.numel(), list(p.shape), p.mean(), p.std(), p.dtype) |
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) |
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flops = get_flops(model, imgsz) |
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fused = " (fused)" if getattr(model, "is_fused", lambda: False)() else "" |
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fs = f", {flops:.1f} GFLOPs" if flops else "" |
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yaml_file = getattr(model, "yaml_file", "") or getattr(model, "yaml", {}).get("yaml_file", "") |
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model_name = Path(yaml_file).stem.replace("yolo", "YOLO") or "Model" |
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LOGGER.info(f"{model_name} summary{fused}: {n_l} layers, {n_p} parameters, {n_g} gradients{fs}") |
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return n_l, n_p, n_g, flops |
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def get_num_params(model): |
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"""Return the total number of parameters in a YOLO model.""" |
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return sum(x.numel() for x in model.parameters()) |
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def get_num_gradients(model): |
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"""Return the total number of parameters with gradients in a YOLO model.""" |
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return sum(x.numel() for x in model.parameters() if x.requires_grad) |
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def model_info_for_loggers(trainer): |
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""" |
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Return model info dict with useful model information. |
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Example: |
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YOLOv8n info for loggers |
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```python |
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results = {'model/parameters': 3151904, |
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'model/GFLOPs': 8.746, |
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'model/speed_ONNX(ms)': 41.244, |
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'model/speed_TensorRT(ms)': 3.211, |
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'model/speed_PyTorch(ms)': 18.755} |
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``` |
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""" |
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if trainer.args.profile: # profile ONNX and TensorRT times |
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from ultralytics.utils.benchmarks import ProfileModels |
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results = ProfileModels([trainer.last], device=trainer.device).profile()[0] |
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results.pop("model/name") |
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else: # only return PyTorch times from most recent validation |
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results = { |
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"model/parameters": get_num_params(trainer.model), |
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"model/GFLOPs": round(get_flops(trainer.model), 3), |
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} |
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results["model/speed_PyTorch(ms)"] = round(trainer.validator.speed["inference"], 3) |
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return results |
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def get_flops(model, imgsz=640): |
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"""Return a YOLO model's FLOPs.""" |
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if not thop: |
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return 0.0 # if not installed return 0.0 GFLOPs |
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try: |
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model = de_parallel(model) |
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p = next(model.parameters()) |
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if not isinstance(imgsz, list): |
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imgsz = [imgsz, imgsz] # expand if int/float |
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try: |
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# Use stride size for input tensor |
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stride = max(int(model.stride.max()), 32) if hasattr(model, "stride") else 32 # max stride |
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im = torch.empty((1, p.shape[1], stride, stride), device=p.device) # input image in BCHW format |
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flops = thop.profile(deepcopy(model), inputs=[im], verbose=False)[0] / 1e9 * 2 # stride GFLOPs |
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return flops * imgsz[0] / stride * imgsz[1] / stride # imgsz GFLOPs |
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except Exception: |
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# Use actual image size for input tensor (i.e. required for RTDETR models) |
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im = torch.empty((1, p.shape[1], *imgsz), device=p.device) # input image in BCHW format |
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return thop.profile(deepcopy(model), inputs=[im], verbose=False)[0] / 1e9 * 2 # imgsz GFLOPs |
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except Exception: |
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return 0.0 |
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def get_flops_with_torch_profiler(model, imgsz=640): |
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"""Compute model FLOPs (thop alternative).""" |
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if TORCH_2_0: |
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model = de_parallel(model) |
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p = next(model.parameters()) |
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stride = (max(int(model.stride.max()), 32) if hasattr(model, "stride") else 32) * 2 # max stride |
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im = torch.zeros((1, p.shape[1], stride, stride), device=p.device) # input image in BCHW format |
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with torch.profiler.profile(with_flops=True) as prof: |
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model(im) |
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flops = sum(x.flops for x in prof.key_averages()) / 1e9 |
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imgsz = imgsz if isinstance(imgsz, list) else [imgsz, imgsz] # expand if int/float |
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flops = flops * imgsz[0] / stride * imgsz[1] / stride # 640x640 GFLOPs |
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return flops |
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return 0 |
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def initialize_weights(model): |
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"""Initialize model weights to random values.""" |
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for m in model.modules(): |
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t = type(m) |
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if t is nn.Conv2d: |
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pass # nn.init.kaiming_normal_(m.weight, mode='fan_out', nonlinearity='relu') |
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elif t is nn.BatchNorm2d: |
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m.eps = 1e-3 |
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m.momentum = 0.03 |
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elif t in [nn.Hardswish, nn.LeakyReLU, nn.ReLU, nn.ReLU6, nn.SiLU]: |
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m.inplace = True |
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def scale_img(img, ratio=1.0, same_shape=False, gs=32): |
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"""Scales and pads an image tensor of shape img(bs,3,y,x) based on given ratio and grid size gs, optionally |
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retaining the original shape. |
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""" |
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if ratio == 1.0: |
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return img |
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h, w = img.shape[2:] |
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s = (int(h * ratio), int(w * ratio)) # new size |
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img = F.interpolate(img, size=s, mode="bilinear", align_corners=False) # resize |
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if not same_shape: # pad/crop img |
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h, w = (math.ceil(x * ratio / gs) * gs for x in (h, w)) |
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return F.pad(img, [0, w - s[1], 0, h - s[0]], value=0.447) # value = imagenet mean |
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def make_divisible(x, divisor): |
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"""Returns nearest x divisible by divisor.""" |
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if isinstance(divisor, torch.Tensor): |
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divisor = int(divisor.max()) # to int |
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return math.ceil(x / divisor) * divisor |
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def copy_attr(a, b, include=(), exclude=()): |
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"""Copies attributes from object 'b' to object 'a', with options to include/exclude certain attributes.""" |
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for k, v in b.__dict__.items(): |
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if (len(include) and k not in include) or k.startswith("_") or k in exclude: |
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continue |
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else: |
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setattr(a, k, v) |
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def get_latest_opset(): |
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"""Return second-most (for maturity) recently supported ONNX opset by this version of torch.""" |
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return max(int(k[14:]) for k in vars(torch.onnx) if "symbolic_opset" in k) - 1 # opset |
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def intersect_dicts(da, db, exclude=()): |
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"""Returns a dictionary of intersecting keys with matching shapes, excluding 'exclude' keys, using da values.""" |
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return {k: v for k, v in da.items() if k in db and all(x not in k for x in exclude) and v.shape == db[k].shape} |
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def is_parallel(model): |
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"""Returns True if model is of type DP or DDP.""" |
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return isinstance(model, (nn.parallel.DataParallel, nn.parallel.DistributedDataParallel)) |
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def de_parallel(model): |
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"""De-parallelize a model: returns single-GPU model if model is of type DP or DDP.""" |
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return model.module if is_parallel(model) else model |
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def one_cycle(y1=0.0, y2=1.0, steps=100): |
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"""Returns a lambda function for sinusoidal ramp from y1 to y2 https://arxiv.org/pdf/1812.01187.pdf.""" |
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return lambda x: max((1 - math.cos(x * math.pi / steps)) / 2, 0) * (y2 - y1) + y1 |
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def init_seeds(seed=0, deterministic=False): |
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"""Initialize random number generator (RNG) seeds https://pytorch.org/docs/stable/notes/randomness.html.""" |
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random.seed(seed) |
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np.random.seed(seed) |
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torch.manual_seed(seed) |
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torch.cuda.manual_seed(seed) |
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torch.cuda.manual_seed_all(seed) # for Multi-GPU, exception safe |
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# torch.backends.cudnn.benchmark = True # AutoBatch problem https://github.com/ultralytics/yolov5/issues/9287 |
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if deterministic: |
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if TORCH_2_0: |
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torch.use_deterministic_algorithms(True, warn_only=True) # warn if deterministic is not possible |
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torch.backends.cudnn.deterministic = True |
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os.environ["CUBLAS_WORKSPACE_CONFIG"] = ":4096:8" |
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os.environ["PYTHONHASHSEED"] = str(seed) |
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else: |
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LOGGER.warning("WARNING ⚠️ Upgrade to torch>=2.0.0 for deterministic training.") |
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else: |
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torch.use_deterministic_algorithms(False) |
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torch.backends.cudnn.deterministic = False |
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class ModelEMA: |
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"""Updated Exponential Moving Average (EMA) from https://github.com/rwightman/pytorch-image-models |
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Keeps a moving average of everything in the model state_dict (parameters and buffers) |
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For EMA details see https://www.tensorflow.org/api_docs/python/tf/train/ExponentialMovingAverage |
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To disable EMA set the `enabled` attribute to `False`. |
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|
""" |
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|
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def __init__(self, model, decay=0.9999, tau=2000, updates=0): |
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"""Create EMA.""" |
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self.ema = deepcopy(de_parallel(model)).eval() # FP32 EMA |
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self.updates = updates # number of EMA updates |
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self.decay = lambda x: decay * (1 - math.exp(-x / tau)) # decay exponential ramp (to help early epochs) |
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for p in self.ema.parameters(): |
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p.requires_grad_(False) |
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self.enabled = True |
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|
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def update(self, model): |
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"""Update EMA parameters.""" |
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|
if self.enabled: |
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self.updates += 1 |
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d = self.decay(self.updates) |
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|
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msd = de_parallel(model).state_dict() # model state_dict |
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|
for k, v in self.ema.state_dict().items(): |
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|
if v.dtype.is_floating_point: # true for FP16 and FP32 |
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v *= d |
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v += (1 - d) * msd[k].detach() |
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# assert v.dtype == msd[k].dtype == torch.float32, f'{k}: EMA {v.dtype}, model {msd[k].dtype}' |
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def update_attr(self, model, include=(), exclude=("process_group", "reducer")): |
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|
"""Updates attributes and saves stripped model with optimizer removed.""" |
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|
if self.enabled: |
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copy_attr(self.ema, model, include, exclude) |
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def strip_optimizer(f: Union[str, Path] = "best.pt", s: str = "") -> None: |
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|
""" |
|
|
Strip optimizer from 'f' to finalize training, optionally save as 's'. |
|
|
|
|
|
Args: |
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|
f (str): file path to model to strip the optimizer from. Default is 'best.pt'. |
|
|
s (str): file path to save the model with stripped optimizer to. If not provided, 'f' will be overwritten. |
|
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|
|
|
Returns: |
|
|
None |
|
|
|
|
|
Example: |
|
|
```python |
|
|
from pathlib import Path |
|
|
from ultralytics.utils.torch_utils import strip_optimizer |
|
|
|
|
|
for f in Path('path/to/weights').rglob('*.pt'): |
|
|
strip_optimizer(f) |
|
|
``` |
|
|
""" |
|
|
x = torch.load(f, map_location=torch.device("cpu")) |
|
|
if "model" not in x: |
|
|
LOGGER.info(f"Skipping {f}, not a valid Ultralytics model.") |
|
|
return |
|
|
|
|
|
if hasattr(x["model"], "args"): |
|
|
x["model"].args = dict(x["model"].args) # convert from IterableSimpleNamespace to dict |
|
|
args = {**DEFAULT_CFG_DICT, **x["train_args"]} if "train_args" in x else None # combine args |
|
|
if x.get("ema"): |
|
|
x["model"] = x["ema"] # replace model with ema |
|
|
for k in "optimizer", "best_fitness", "ema", "updates": # keys |
|
|
x[k] = None |
|
|
x["epoch"] = -1 |
|
|
x["model"].half() # to FP16 |
|
|
for p in x["model"].parameters(): |
|
|
p.requires_grad = False |
|
|
x["train_args"] = {k: v for k, v in args.items() if k in DEFAULT_CFG_KEYS} # strip non-default keys |
|
|
# x['model'].args = x['train_args'] |
|
|
torch.save(x, s or f) |
|
|
mb = os.path.getsize(s or f) / 1e6 # file size |
|
|
LOGGER.info(f"Optimizer stripped from {f},{f' saved as {s},' if s else ''} {mb:.1f}MB") |
|
|
|
|
|
|
|
|
def profile(input, ops, n=10, device=None): |
|
|
""" |
|
|
Ultralytics speed, memory and FLOPs profiler. |
|
|
|
|
|
Example: |
|
|
```python |
|
|
from ultralytics.utils.torch_utils import profile |
|
|
|
|
|
input = torch.randn(16, 3, 640, 640) |
|
|
m1 = lambda x: x * torch.sigmoid(x) |
|
|
m2 = nn.SiLU() |
|
|
profile(input, [m1, m2], n=100) # profile over 100 iterations |
|
|
``` |
|
|
""" |
|
|
results = [] |
|
|
if not isinstance(device, torch.device): |
|
|
device = select_device(device) |
|
|
LOGGER.info( |
|
|
f"{'Params':>12s}{'GFLOPs':>12s}{'GPU_mem (GB)':>14s}{'forward (ms)':>14s}{'backward (ms)':>14s}" |
|
|
f"{'input':>24s}{'output':>24s}" |
|
|
) |
|
|
|
|
|
for x in input if isinstance(input, list) else [input]: |
|
|
x = x.to(device) |
|
|
x.requires_grad = True |
|
|
for m in ops if isinstance(ops, list) else [ops]: |
|
|
m = m.to(device) if hasattr(m, "to") else m # device |
|
|
m = m.half() if hasattr(m, "half") and isinstance(x, torch.Tensor) and x.dtype is torch.float16 else m |
|
|
tf, tb, t = 0, 0, [0, 0, 0] # dt forward, backward |
|
|
try: |
|
|
flops = thop.profile(m, inputs=[x], verbose=False)[0] / 1e9 * 2 if thop else 0 # GFLOPs |
|
|
except Exception: |
|
|
flops = 0 |
|
|
|
|
|
try: |
|
|
for _ in range(n): |
|
|
t[0] = time_sync() |
|
|
y = m(x) |
|
|
t[1] = time_sync() |
|
|
try: |
|
|
(sum(yi.sum() for yi in y) if isinstance(y, list) else y).sum().backward() |
|
|
t[2] = time_sync() |
|
|
except Exception: # no backward method |
|
|
# print(e) # for debug |
|
|
t[2] = float("nan") |
|
|
tf += (t[1] - t[0]) * 1000 / n # ms per op forward |
|
|
tb += (t[2] - t[1]) * 1000 / n # ms per op backward |
|
|
mem = torch.cuda.memory_reserved() / 1e9 if torch.cuda.is_available() else 0 # (GB) |
|
|
s_in, s_out = (tuple(x.shape) if isinstance(x, torch.Tensor) else "list" for x in (x, y)) # shapes |
|
|
p = sum(x.numel() for x in m.parameters()) if isinstance(m, nn.Module) else 0 # parameters |
|
|
LOGGER.info(f"{p:12}{flops:12.4g}{mem:>14.3f}{tf:14.4g}{tb:14.4g}{str(s_in):>24s}{str(s_out):>24s}") |
|
|
results.append([p, flops, mem, tf, tb, s_in, s_out]) |
|
|
except Exception as e: |
|
|
LOGGER.info(e) |
|
|
results.append(None) |
|
|
torch.cuda.empty_cache() |
|
|
return results |
|
|
|
|
|
|
|
|
class EarlyStopping: |
|
|
"""Early stopping class that stops training when a specified number of epochs have passed without improvement.""" |
|
|
|
|
|
def __init__(self, patience=50): |
|
|
""" |
|
|
Initialize early stopping object. |
|
|
|
|
|
Args: |
|
|
patience (int, optional): Number of epochs to wait after fitness stops improving before stopping. |
|
|
""" |
|
|
self.best_fitness = 0.0 # i.e. mAP |
|
|
self.best_epoch = 0 |
|
|
self.patience = patience or float("inf") # epochs to wait after fitness stops improving to stop |
|
|
self.possible_stop = False # possible stop may occur next epoch |
|
|
|
|
|
def __call__(self, epoch, fitness): |
|
|
""" |
|
|
Check whether to stop training. |
|
|
|
|
|
Args: |
|
|
epoch (int): Current epoch of training |
|
|
fitness (float): Fitness value of current epoch |
|
|
|
|
|
Returns: |
|
|
(bool): True if training should stop, False otherwise |
|
|
""" |
|
|
if fitness is None: # check if fitness=None (happens when val=False) |
|
|
return False |
|
|
|
|
|
if fitness >= self.best_fitness: # >= 0 to allow for early zero-fitness stage of training |
|
|
self.best_epoch = epoch |
|
|
self.best_fitness = fitness |
|
|
delta = epoch - self.best_epoch # epochs without improvement |
|
|
self.possible_stop = delta >= (self.patience - 1) # possible stop may occur next epoch |
|
|
stop = delta >= self.patience # stop training if patience exceeded |
|
|
if stop: |
|
|
LOGGER.info( |
|
|
f"Stopping training early as no improvement observed in last {self.patience} epochs. " |
|
|
f"Best results observed at epoch {self.best_epoch}, best model saved as best.pt.\n" |
|
|
f"To update EarlyStopping(patience={self.patience}) pass a new patience value, " |
|
|
f"i.e. `patience=300` or use `patience=0` to disable EarlyStopping." |
|
|
) |
|
|
return stop
|
|
|
|
