使用R语言中有两个文件夹的CT照片分别对应感染和健康两种状态调用tensorflow进行训练并预测
以下是一个简单的使用R语言和TensorFlow进行CT照片分类的代码示例:
首先,需要安装并加载tensorflow和其他必要的R包:
install.packages("tensorflow")
install.packages("magick")
library(tensorflow)
library(magick)
接下来,我们需要将CT照片加载到R中,并转换为TensorFlow需要的格式。我们将在两个文件夹感染和健康中分别加载照片,并为每个照片分配标签(0表示感染,1表示健康):
# 加载照片并为其分配标签
infected_images <- list.files("infected", full.names = TRUE)
healthy_images <- list.files("healthy", full.names = TRUE)
infected_images <- lapply(infected_images, image_read)
healthy_images <- lapply(healthy_images, image_read)
infected_labels <- rep(0, length(infected_images))
healthy_labels <- rep(1, length(healthy_images))
# 将照片转换为TensorFlow需要的格式
infected_images <- lapply(infected_images, image_resize("32x32!"))
infected_images <- lapply(infected_images, image_to_array())
infected_images <- lapply(infected_images, array_reshape(c(-1, 32, 32, 3)))
healthy_images <- lapply(healthy_images, image_resize("32x32!"))
healthy_images <- lapply(healthy_images, image_to_array())
healthy_images <- lapply(healthy_images, array_reshape(c(-1, 32, 32, 3)))
# 将照片和标签合并为一个数据集
x <- array_reshape(rbind(infected_images, healthy_images),
c(-1, 32, 32, 3))
y <- c(infected_labels, healthy_labels)
现在我们准备好训练模型了。我们将使用一个简单的卷积神经网络(CNN)来分类CT照片。我们将数据集分为训练集和测试集,并使用训练集来训练模型:
# 将数据集分为训练集和测试集
set.seed(123)
train_indices <- sample(1:length(y), round(length(y) * 0.8))
test_indices <- setdiff(1:length(y), train_indices)
x_train <- x[train_indices, , , ]
y_train <- y[train_indices]
x_test <- x[test_indices, , , ]
y_test <- y[test_indices]
# 创建CNN模型
cnn_model <- keras_model_sequential() %>%
layer_conv_2d(filters = 32, kernel_size = c(3, 3), activation = "relu", input_shape = c(32, 32, 3)) %>%
layer_max_pooling_2d(pool_size = c(2, 2)) %>%
layer_conv_2d(filters = 64, kernel_size = c(3, 3), activation = "relu") %>%
layer_max_pooling_2d(pool_size = c(2, 2)) %>%
layer_flatten() %>%
layer_dense(units = 128, activation = "relu") %>%
layer_dropout(rate = 0.5) %>%
layer_dense(units = 1, activation = "sigmoid")
# 编译模型
cnn_model %>% compile(
loss = "binary_crossentropy",
optimizer = "adam",
metrics = c("accuracy")
)
# 训练模型
history <- cnn_model %>% fit(
x_train, y_train,
epochs = 10,
batch_size = 32,
validation_data = list(x_test, y_test)
)
训练模型需要一些时间,具体取决于你的计算机性能和数据集的大小。完成训练后,我们可以使用测试集来评估模型的性能:
# 使用测试集评估模型
cnn_model %>% evaluate(x_test, y_test)
最后,我们可以使用训练好的模型来预测新的CT照片的分类:
# 预测新的CT照片的分类
new_image <- image_read("new_image.jpg")
new_image <- image_resize(new_image, "32x32!")
new_image <- image_to_array(new_image)
new_image <- array_reshape(new_image, c(1, 32, 32, 3))
cnn_model %>% predict(new_image)
注意,这里我们假设有一张名为“new_image.jpg”的新CT照片,它位于当前工作目录中。您需要将其替换为您自己的照片,并确保其大小与训练集中的照片相同
原文地址: https://www.cveoy.top/t/topic/fJcy 著作权归作者所有。请勿转载和采集!