def predict(self, dataloader, test_label, scale=True): with torch.no_grad(): collector = [] pred_time = [] for i, data in enumerate(dataloader, 0): #枚举函数 封装 dataloader start_time = time.time() input_data = data.permute([0,2,1]).float().to(self.device) fake, _, _, _ = self.G(input_data) fake = fake.type(torch.DoubleTensor) data = data.type(torch.DoubleTensor) rec_error = torch.sum(torch.abs((fake.permute([0,2,1]) - data)), dim=2) collector.append(rec_error[:, -1])#取每个窗口最后一个点的重构误差 pred_time.append(time.time() - start_time) score = np.concatenate(collector, axis=0) # Scale error vector between [0, 1] if scale: score = (score - np.min(score)) / (np.max(score) - np.min(score)) y_ = test_label y_pred = score if y_ is not None and len(y_) > len(y_pred): y_ = y_[-len(y_pred):] return y_, y_pred, np.mean(pred_time)
时间: 2023-05-27 16:02:20 浏览: 63
这段代码是一个Python函数,函数名为"predict"。它有三个参数,分别是"dataloader"、"test_label"和"scale"。函数的作用是根据输入数据进行预测,并返回预测结果。
在函数体内部,使用了Python中的"with torch.no_grad()"语句,表示在预测的过程中不需要计算梯度。然后定义了两个空列表,分别是"collector"和"pred_time"。
接下来,使用Python中的"enumerate"函数来遍历"dataloader"中的数据,使用变量"data"来存储每一个数据。直到遍历完所有数据为止。
函数的返回值是预测结果。
相关问题
修改以下代码使其能够输出模型预测结果: def open_image(self): file_dialog = QFileDialog() file_paths, _ = file_dialog.getOpenFileNames(self, "选择图片", "", "Image Files (*.png *.jpg *.jpeg)") if file_paths: self.display_images(file_paths) def preprocess_images(self, image_paths): data_transform = transforms.Compose([ transforms.CenterCrop(150), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]) ]) self.current_image_paths = [] images = [] for image_path in image_paths: image = Image.open(image_path) image = data_transform(image) image = torch.unsqueeze(image, dim=0) images.append(image) self.current_image_paths.append(image_path) return images def predict_images(self): if not self.current_image_paths: return for i, image_path in enumerate(self.current_image_paths): image = self.preprocess_image(image_path) output = self.model(image) predicted_class = self.class_dict[output.argmax().item()] self.result_labels[i].setText(f"Predicted Class: {predicted_class}") self.progress_bar.setValue((i+1)*20) def display_images(self, image_paths): for i, image_path in enumerate(image_paths): image = QImage(image_path) image = image.scaled(300, 300, Qt.KeepAspectRatio) if i == 0: self.image_label_1.setPixmap(QPixmap.fromImage(image)) elif i == 1: self.image_label_2.setPixmap(QPixmap.fromImage(image)) elif i == 2: self.image_label_3.setPixmap(QPixmap.fromImage(image)) elif i == 3: self.image_label_4.setPixmap(QPixmap.fromImage(image)) elif i == 4: self.image_label_5.setPixmap(QPixmap.fromImage(image))
请注意,代码中的 preprocess_images 函数和 predict_images 函数中的 self.preprocess_image(image_path) 需要修改为 self.preprocess_images([image_path])。修改后的代码如下:
```
def open_image(self):
file_dialog = QFileDialog()
file_paths, _ = file_dialog.getOpenFileNames(self, "选择图片", "", "Image Files (*.png *.jpg *.jpeg)")
if file_paths:
self.display_images(file_paths)
def preprocess_images(self, image_paths):
data_transform = transforms.Compose([
transforms.CenterCrop(150),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
])
self.current_image_paths = []
images = []
for image_path in image_paths:
image = Image.open(image_path)
image = data_transform(image)
image = torch.unsqueeze(image, dim=0)
images.append(image)
self.current_image_paths.append(image_path)
return images
def predict_images(self):
if not self.current_image_paths:
return
for i, image_path in enumerate(self.current_image_paths):
image = self.preprocess_images([image_path])
output = self.model(image[0])
predicted_class = self.class_dict[output.argmax().item()]
self.result_labels[i].setText(f"Predicted Class: {predicted_class}")
self.progress_bar.setValue((i+1)*20)
def display_images(self, image_paths):
for i, image_path in enumerate(image_paths):
image = QImage(image_path)
image = image.scaled(300, 300, Qt.KeepAspectRatio)
if i == 0:
self.image_label_1.setPixmap(QPixmap.fromImage(image))
elif i == 1:
self.image_label_2.setPixmap(QPixmap.fromImage(image))
elif i == 2:
self.image_label_3.setPixmap(QPixmap.fromImage(image))
elif i == 3:
self.image_label_4.setPixmap(QPixmap.fromImage(image))
elif i == 4:
self.image_label_5.setPixmap(QPixmap.fromImage(image))
```
解释以下语句:test_datasets = Dataset(TEST_DIR) test_dataloader = DataLoader(test_datasets, batch_size=BATCH_SIZE, shuffle=False) with torch.no_grad(): pred = [] for idx, x in tqdm(enumerate(test_dataloader), dynamic_ncols=True): x = x.float().to(DEVICE) output = xgb_model.predict(x.cpu().numpy()) pred += output.tolist() # print(output) height, width, projection, geo_transform = test_datasets.get_properties() to_tiff(np.array(pred).reshape(height, width).astype(np.float32), height, width, projection, geo_transform)
这段代码的作用是使用测试数据集来进行预测,并将预测结果保存为一个 TIFF 文件。
首先,`test_datasets = Dataset(TEST_DIR)`创建了一个测试数据集对象,其参数 `TEST_DIR` 是测试数据集的路径。
接着,`test_dataloader = DataLoader(test_datasets, batch_size=BATCH_SIZE, shuffle=False)`创建了一个数据加载器对象,用于批量加载测试数据集。其中`BATCH_SIZE`是批量大小,`shuffle=False`表示不对数据进行洗牌。
下面的代码使用了 `torch.no_grad()` 上下文管理器,它会关闭梯度计算,以便在推理过程中节省内存。
在 `for` 循环中,`tqdm(enumerate(test_dataloader), dynamic_ncols=True)`迭代测试数据集中的每个批次。`enumerate()`函数将返回每个批次的索引和数据。
在每个批次中,`x = x.float().to(DEVICE)`将输入数据转换为 `float` 类型,并将其移动到指定的设备上(例如 GPU)。
`output = xgb_model.predict(x.cpu().numpy())`使用 XGBoost 模型 `xgb_model` 对输入数据进行预测,并将预测结果保存在 `output` 变量中。
接下来,`pred += output.tolist()`将每个批次的预测结果添加到 `pred` 列表中。
最后,`height, width, projection, geo_transform = test_datasets.get_properties()`获得测试数据集的属性,包括高度、宽度、投影和地理变换。
最后一行代码 `to_tiff(np.array(pred).reshape(height, width).astype(np.float32), height, width, projection, geo_transform)`将预测结果转换为 NumPy 数组,并调用名为 `to_tiff()` 的函数将结果保存为 TIFF 文件。函数的参数包括预测结果数组、高度、宽度、投影和地理变换信息。