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import torch
import torch.nn as nn
import torchvision.models as models
from modelscope.msdatasets import MsDataset
from datasets import load_dataset
from utils import MODEL_DIR, EN_US
class EvalNet:
model: nn.Module = None
m_type = "squeezenet"
input_size = 224
output_size = 512
def __init__(self, log_name: str, cls_num: int):
saved_model_path = f"{MODEL_DIR}/{log_name}/save.pt"
m_ver = "_".join(log_name.split("_")[:-3])
self.m_type, self.input_size = self._model_info(m_ver)
if not hasattr(models, m_ver):
raise ValueError("不支持的模型")
self.model = eval("models.%s()" % m_ver)
linear_output = self._set_outsize()
self._set_classifier(cls_num, linear_output)
checkpoint = torch.load(saved_model_path, map_location="cpu")
if torch.cuda.is_available():
checkpoint = torch.load(saved_model_path)
self.model.load_state_dict(checkpoint, False)
self.model.eval()
def _get_backbone(self, ver: str, backbone_list: list):
for bb in backbone_list:
if ver == bb["ver"]:
return bb
print("未找到骨干网络名称，使用默认选项 - alexnet")
return backbone_list[0]
def _model_info(self, m_ver: str):
backbone_list = (
load_dataset("monetjoe/cv_backbones", split="train")
if EN_US
else MsDataset.load("monetjoe/cv_backbones", split="v1")
)
backbone = self._get_backbone(m_ver, backbone_list)
m_type = str(backbone["type"])
input_size = int(backbone["input_size"])
return m_type, input_size
def _classifier(self, cls_num: int, output_size: int, linear_output: bool):
q = (1.0 * output_size / cls_num) ** 0.25
l1 = int(q * cls_num)
l2 = int(q * l1)
l3 = int(q * l2)
if linear_output:
return torch.nn.Sequential(
nn.Dropout(),
nn.Linear(output_size, l3),
nn.ReLU(inplace=True),
nn.Dropout(),
nn.Linear(l3, l2),
nn.ReLU(inplace=True),
nn.Dropout(),
nn.Linear(l2, l1),
nn.ReLU(inplace=True),
nn.Linear(l1, cls_num),
)
else:
return torch.nn.Sequential(
nn.Dropout(),
nn.Conv2d(output_size, l3, kernel_size=(1, 1), stride=(1, 1)),
nn.ReLU(inplace=True),
nn.AdaptiveAvgPool2d(output_size=(1, 1)),
nn.Flatten(),
nn.Linear(l3, l2),
nn.ReLU(inplace=True),
nn.Dropout(),
nn.Linear(l2, l1),
nn.ReLU(inplace=True),
nn.Linear(l1, cls_num),
)
def _set_outsize(self):
for name, module in self.model.named_modules():
if (
str(name).__contains__("classifier")
or str(name).__eq__("fc")
or str(name).__contains__("head")
or hasattr(module, "classifier")
):
if isinstance(module, torch.nn.Linear):
self.output_size = module.in_features
return True
if isinstance(module, torch.nn.Conv2d):
self.output_size = module.in_channels
return False
return False
def _set_classifier(self, cls_num: int, linear_output: bool):
if self.m_type == "convnext":
del self.model.classifier[2]
self.model.classifier = nn.Sequential(
*list(self.model.classifier)
+ list(self._classifier(cls_num, self.output_size, linear_output))
)
return
elif self.m_type == "maxvit":
del self.model.classifier[5]
self.model.classifier = nn.Sequential(
*list(self.model.classifier)
+ list(self._classifier(cls_num, self.output_size, linear_output))
)
return
if hasattr(self.model, "classifier"):
self.model.classifier = self._classifier(
cls_num, self.output_size, linear_output
)
return
elif hasattr(self.model, "fc"):
self.model.fc = self._classifier(cls_num, self.output_size, linear_output)
return
elif hasattr(self.model, "head"):
self.model.head = self._classifier(cls_num, self.output_size, linear_output)
return
self.model.heads.head = self._classifier(
cls_num, self.output_size, linear_output
)
def forward(self, x: torch.Tensor):
if torch.cuda.is_available():
x = x.cuda()
self.model = self.model.cuda()
if self.m_type == "googlenet":
return self.model(x)[0]
else:
return self.model(x)
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