five flower classify
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概述
基于以下五种花的样本(每种花约有样本780张)训练出一个能识别如下五种花的模型,运行在PC上且准确率达90%以上。
任务:训练出一个能识别如下五种花的模型,能够运行在PC上且准确率达90%。
How to implement flowers sample classify?
解决问题
1.获取并分析样本结构
- 图片格式:jpg
- 图片大小不一致
- 图片颜色不一致
- 花在图片中的位置不一致
2.选择模型
- 分析问题类型
- 选择方法
- 根据经验
- 借助网络的知识(论文、开源网站等)
- just try and compare
- 主要因素
- 模型大小
- 模型准确率
- 模型运行速度
- 模型运行的内存占用
如果只是想练个手做个demo,那么不考虑因素,直接上可以。但如果后面想做一个正规的项目。这些因素特别重要。**这些值怎么来,论文后面有,经典的模型网上也有资料说明其准确率,复杂度等。**运行速度也很重要。比如我们这是一个类似于形色的app。你希望其多久能对一张花进行识别。这就是它的运行速度。
3.画出pipeline
实现部分
图片预处理
由于图片较多不好操作,所以首先将图片存入 tfrecorder
TFRecords TFRecords其实是一种二进制文件,虽然它不如其他格式好理解,但是它能更好的利用内存,更方便复制和移动,并且不需要单独的标签文件(等会儿就知道为什么了)… …总而言之,这样的文件格式好处多多,所以让我们用起来吧。
TFRecords文件包含了tf.train.Example 协议内存块(protocol buffer)(协议内存块包含了字段 Features)。我们可以写一段代码获取你的数据, 将数据填入到Example协议内存块(protocol buffer),将协议内存块序列化为一个字符串, 并且通过tf.python_io.TFRecordWriter 写入到TFRecords文件。
从TFRecords文件中读取数据, 可以使用tf.TFRecordReader的tf.parse_single_example解析器。这个操作可以将Example协议内存块(protocol buffer)解析为张量。
图片预处理代码实现
1.采用直接 resize的方式
#resize imagesdef resize_image(impath,imagename,(weight,height)): with tf.Session() as sess: img = Image.open(impath) img = img.resize((weight,height)) resize_data = img.tobytes() #filename = "/home/workdir/tensorflow/flowers/resize/"+imagename #with tf.gfile.GFile(filename,"wb") as f: # f.write(resize_image.eval()) return resize_datadef convert_images_to_xy(main_folder_path): os.chdir(main_folder_path) foldernames = os.listdir(os.getcwd()) labels = [] images_data = [] #use int index to replace the string lable index = 0 for folder_name in foldernames: print 'folder_name = ' print folder_name os.chdir(main_folder_path + folder_name) filenames = os.listdir(os.getcwd()) for file_name in filenames: file_glob_name = os.path.join(main_folder_path, folder_name, file_name) print file_glob_name labels.append(index) resize_image_dat = resize_image(file_glob_name,file_name,(IMAGE_WEIGHT, IMAGE_HEIGHT)) images_data.append(resize_image_dat) index = index + 1 return images_data, labels
2.采用先pad到固定比例在resize方法 (改方法不好让图片变形,但是图片会有黑边,padding 0导致)
def resize_image(impath,imagename, shape, index): # img = Image.open(impath) # img = img.resize((shape[0],shape[1])) # resize_data = img.tobytes() global number # avoid memory leak. tf.reset_default_graph() graph = tf.Graph() with graph.as_default() as g: with tf.Session(graph = g) as sess: image_raw_data = tf.gfile.FastGFile(impath, "rb").read() # 按照jpeg的格式解码图片。 image_data = tf.image.decode_jpeg(image_raw_data) image_data = tf.image.convert_image_dtype(image_data, dtype=tf.float32) shape = image_data.eval(session=sess).shape result = shape[0] if shape[0] < shape[1]: result = shape[1] cropped = tf.image.resize_image_with_crop_or_pad(image_data, result, result) resize = tf.image.resize_images(cropped, [IMAGE_WEIGHT, IMAGE_WEIGHT]) result = sess.run(resize) # print("result[50][50]:", result[50][50]) # plt.imshow(result) # plt.show() result_raw = result.tostring() # resize_f = resize / 255.0 # resized = np.asarray(resize.eval(session = sess), dtype='uint8') print(result.shape, " num is:" ,number) # resized_data = resized.tobytes() example = tf.train.Example(features=tf.train.Features(feature={ 'image_raw': _bytes_feature(result_raw), 'label': _int64_feature(index)})) writer.write(example.SerializeToString())
训练网络
1.主要代码解释
#读取数据 tfredcord数据def read_samples_record(filename_queue): reader = tf.TFRecordReader() _, serialized_example = reader.read(filename_queue) features = tf.parse_single_example(serialized_example, features={ 'image_raw': tf.FixedLenFeature([], tf.string), 'label': tf.FixedLenFeature([], tf.int64), }) image = tf.decode_raw(features['image_raw'], tf.float32) print (image) #reshape the image data image = tf.reshape(image, [IMAGE_WEIGHT, IMAGE_HEIGHT, IMAGE_CHANEL]) # image = tf.cast(image, tf.float32) print (image) label = tf.cast(features['label'], tf.int32) return image,label#构建网络# Model inputX = tf.placeholder(tf.float32, shape=[None, IMAGE_WEIGHT, IMAGE_HEIGHT, IMAGE_CHANEL], name='X')y_ = tf.placeholder(tf.int32, [None, ], name='y_')keep_prob = tf.placeholder(tf.float32)conv1 = tf.layers.conv2d( inputs=X, filters=32, kernel_size=[3, 3], padding="same", activation=tf.nn.relu, kernel_initializer=tf.truncated_normal_initializer(stddev=0.1))pool1 = tf.layers.max_pooling2d(inputs=conv1,pool_size=[2, 2], strides=2)conv2 = tf.layers.conv2d( inputs=pool1, filters=64, kernel_size=[3, 3], padding="same", activation=tf.nn.relu, kernel_initializer=tf.truncated_normal_initializer(stddev=0.1))pool2 = tf.layers.max_pooling2d(inputs=conv2,pool_size=[2, 2], strides=2)conv3 = tf.layers.conv2d( inputs=pool2, filters=128, kernel_size=[3, 3], padding="same", activation=tf.nn.relu, kernel_initializer=tf.truncated_normal_initializer(stddev=0.1))pool3 = tf.layers.max_pooling2d(inputs=conv3,pool_size=[2, 2], strides=2)conv4 = tf.layers.conv2d( inputs=pool3, filters=256, kernel_size=[3, 3], padding="same", activation=tf.nn.relu, kernel_initializer=tf.truncated_normal_initializer(stddev=0.1))pool4 = tf.layers.max_pooling2d(inputs=conv4,pool_size=[2, 2], strides=2)conv5 = tf.layers.conv2d( inputs=pool4, filters=512, kernel_size=[3, 3], padding="same", activation=tf.nn.relu, kernel_initializer=tf.truncated_normal_initializer(stddev=0.1))#pool5 = tf.layers.max_pooling2d(inputs=conv5,pool_size=[2, 2], strides=2)pool5 = tf.layers.average_pooling2d(inputs=conv5, pool_size=[4, 4], strides = 4)print("pool5 shape is :", pool5.get_shape(), " width:", pool5.get_shape()[1])re1 = tf.reshape(pool5, [-1, int(pool5.get_shape()[1]) * int(pool5.get_shape()[1]) * 512])dense1 = tf.layers.dense(inputs=re1, units=512, activation=tf.nn.relu, kernel_initializer=tf.truncated_normal_initializer(stddev=0.1), kernel_regularizer=tf.contrib.layers.l2_regularizer(0.005))drop1 = tf.nn.dropout(dense1, keep_prob)logits = tf.layers.dense(inputs=drop1, units=5, activation=None, kernel_initializer=tf.truncated_normal_initializer(stddev=0.1), kernel_regularizer=tf.contrib.layers.l2_regularizer(0.005))#定义代价函数loss = tf.losses.sparse_softmax_cross_entropy(labels=y_, logits=logits)train = tf.train.AdamOptimizer(learning_rate=0.0001).minimize(loss)correct_prediction = tf.equal(tf.cast(tf.argmax(logits, 1), tf.int32), y_)#准确率acc = tf.reduce_mean(tf.cast(correct_prediction, tf.float32))#用于保存训练好的模型saver = tf.train.Saver()#开始训练模型for step in range(TRAIN_STEP+1): end_index = min(start_index + TRAIN_BATCH_SIZE, X_train.shape[0]) #print (start_index,end_index) batch_xs = X_train[start_index:end_index, ] batch_ys = y_train[start_index:end_index, ] #print (batch_xs.shape,batch_ys.shape) sess.run(train, feed_dict={X: batch_xs, y_: batch_ys, keep_prob:0.5}) if step % 50 == 0: print ("step %d " % (step)) result = sess.run(merged, feed_dict={ X: batch_xs, y_: batch_ys, keep_prob:1.0}) TrainWriter.add_summary(result, step) val_num = X_val.shape[0] val_result = sess.run(merged, feed_dict={ X: X_val, y_: y_val,keep_prob:1.0}) ValWriter.add_summary(val_result, step) print("train accuracy: %g" % sess.run(acc, feed_dict={X: batch_xs, y_: batch_ys, keep_prob: 1.0})) accuracy = sess.run(acc, feed_dict={X: X_test, y_: y_test, keep_prob:1.0}) print("test accuracy %g" % accuracy) if accuracy > 0.8: saver.save(sess, "save_path/cnn_flower_float.module") if end_index >= X_train.shape[0]: start_index = 0 else: start_index = end_indexsaver.save(sess, "save_path/cnn_flower.module")sess.close()
数据增强
如果第一种方式训练的结果不是很好,可以采用数据增强的方式来提高准确率。
1.将原有数据扩大5倍
#resize imagesdef resize_image(impath,imagename, fold_name): strName = imagename.split('.') save_name = str(TF_filename_prefix) + str(fold_name) + '\\' + str(strName[0]) if not (os.path.exists((str(TF_filename_prefix) + str(fold_name)))): os.makedirs((str(TF_filename_prefix) + str(fold_name))) global number # avoid memory leak. tf.reset_default_graph() graph = tf.Graph() images = [] with graph.as_default() as g: with tf.Session(graph = g) as sess: image_raw_data = tf.gfile.FastGFile(impath, "rb").read() # 按照jpeg的格式解码图片。 image_data = tf.image.decode_jpeg(image_raw_data) print("int :", image_data.eval(session=sess)[50][50]) #image_data = tf.image.convert_image_dtype(image_data, dtype=tf.float32) #print("float :", image_data.eval(session=sess)[50][50]) central_result = tf.image.central_crop(image_data, 0.7) # plt.imshow(central_result.eval(session=sess)) # plt.show() left_right = tf.image.flip_left_right(image_data) # plt.imshow(left_right.eval(session=sess)) # plt.show() contrast = tf.image.adjust_contrast(image_data,0.2) hue = tf.image.adjust_hue(image_data,delta = 0.2) brightness = tf.image.adjust_brightness(image_data, delta=32./255.) image_central = tf.image.encode_jpeg(central_result) images.append(image_central) image_left_right = tf.image.encode_jpeg(left_right) images.append(image_left_right) image_contrast = tf.image.encode_jpeg(contrast) images.append(image_contrast) image_hue= tf.image.encode_jpeg(hue) images.append(image_hue) image_brightness = tf.image.encode_jpeg(brightness) images.append(image_brightness) # 保存图片 i = 0 for img in images: with tf.gfile.GFile(save_name + "_%d.jpg" %i , 'wb') as f: f.write(sess.run(img)) i = i + 1
2.训练模型
#读取数据方式跟之前有些差异,因为测试数据和训练数据保存到了两个 tfrecorder文件。def read_test_record(filename_queue): reader = tf.TFRecordReader() _, serialized_example = reader.read(filename_queue) features = tf.parse_single_example(serialized_example, features={ 'image_raw': tf.FixedLenFeature([], tf.string), 'label': tf.FixedLenFeature([], tf.int64), }) image = tf.decode_raw(features['image_raw'], tf.float32) print(image) # reshape the image data image = tf.reshape(image, [IMAGE_WEIGHT, IMAGE_HEIGHT, IMAGE_CHANEL]) # image = tf.cast(image, tf.float32) print(image) label = tf.cast(features['label'], tf.int32) return image, labeldef read_train_data(filename_queue): reader = tf.TFRecordReader() _, serialized_example = reader.read(filename_queue) features = tf.parse_single_example(serialized_example, features={ 'image_raw': tf.FixedLenFeature([], tf.string), 'label': tf.FixedLenFeature([], tf.int64), }) image = tf.decode_raw(features['image_raw'], tf.float32) image = tf.reshape(image, [IMAGE_WEIGHT, IMAGE_HEIGHT, IMAGE_CHANEL]) label = tf.cast(features['label'], tf.int32) img_batch, lab_batch = tf.train.shuffle_batch([image, label], batch_size=BATCH_SIZE, capacity=17500, min_after_dequeue=3000) #img_batch, lab_batch = tf.train.batch([image, label], batch_size=BATCH_SIZE, capacity=800, num_threads=4) return img_batch, lab_batch #训练部分的代码跟之前相同就不重复了。
Fine tuning
如果觉得数据增强依然不能提高准确率,可以考虑使用数据迁移的方式,因为数据较少,这种方式可以节约训练时间,提高准确率。
# -*- coding: utf-8 -*-"""卷积神经网络 Inception-v3模型 迁移学习"""import globimport os.pathimport randomimport numpy as npimport tensorflow as tffrom tensorflow.python.platform import gfileimport osos.environ['TF_CPP_MIN_LOG_LEVEL']='2'# inception-v3 模型瓶颈层的节点个数BOTTLENECK_TENSOR_SIZE = 2048# inception-v3 模型中代表瓶颈层结果的张量名称BOTTLENECK_TENSOR_NAME = 'pool_3/_reshape:0'# 图像输入张量所对应的名称JPEG_DATA_TENSOR_NAME = 'DecodeJpeg/contents:0'# 下载的谷歌训练好的inception-v3模型文件目录MODEL_DIR = 'D:\\workspace\\PycharmSpace\\flow_classify\\com\\shuan\\flower_classify\\fine_train'# 下载的谷歌训练好的inception-v3模型文件名MODEL_FILE = 'tensorflow_inception_graph.pb'# 保存训练数据通过瓶颈层后提取的特征向量CACHE_DIR = 'tmp/bottleneck'# 图片数据的文件夹INPUT_DATA = 'D:\\workspace\\PycharmSpace\\flow_classify\\com\\shuan\\flower_classify\\flower_photos_780'# 验证的数据百分比VALIDATION_PERCENTAGE = 10# 测试的数据百分比TEST_PERCENTACE = 10# 定义神经网路的设置LEARNING_RATE = 0.01STEPS = 4000BATCH = 128# 不知道大家有注意到没有,数据集里给的是不同大小的图片,而程序里却可以直接送入Inception-v3模型,从而得到同样尺寸的结果特征向量。我在书籍的github上问了这个问题,得到的回复是:Inception-v3模型中包含了图像预处理和大小调整的部分。# 这个函数把数据集分成训练,验证,测试三部分def create_image_lists(testing_percentage, validation_percentage): """ 这个函数把数据集分成训练,验证,测试三部分 :param testing_percentage:测试的数据百分比 10 :param validation_percentage:验证的数据百分比 10 :return: """ result = {} # 获取目录下所有子目录 sub_dirs = [x[0] for x in os.walk(INPUT_DATA)] # ['/path/to/flower_data', '/path/to/flower_data\\daisy', '/path/to/flower_data\\dandelion', # '/path/to/flower_data\\roses', '/path/to/flower_data\\sunflowers', '/path/to/flower_data\\tulips'] # 数组中的第一个目录是当前目录,这里设置标记,不予处理 is_root_dir = True for sub_dir in sub_dirs: # 遍历目录数组,每次处理一种 if is_root_dir: is_root_dir = False continue # 获取当前目录下所有的有效图片文件 extensions = ['jpg', 'jepg', 'JPG', 'JPEG'] file_list = [] dir_name = os.path.basename(sub_dir) # 返回路径名路径的基本名称,如:daisy|dandelion|roses|sunflowers|tulips for extension in extensions: file_glob = os.path.join(INPUT_DATA, dir_name, '*.' + extension) # 将多个路径组合后返回 file_list.extend(glob.glob(file_glob)) # glob.glob返回所有匹配的文件路径列表,extend往列表中追加另一个列表 if not file_list: continue # 通过目录名获取类别名称 label_name = dir_name.lower() # 返回其小写 # 初始化当前类别的训练数据集、测试数据集、验证数据集 training_images = [] testing_images = [] validation_images = [] for file_name in file_list: # 遍历此类图片的每张图片的路径 base_name = os.path.basename(file_name) # 路径的基本名称也就是图片的名称,如:102841525_bd6628ae3c.jpg # 随机讲数据分到训练数据集、测试集和验证集 chance = np.random.randint(100) if chance < validation_percentage: validation_images.append(base_name) elif chance < (testing_percentage + validation_percentage): testing_images.append(base_name) else: training_images.append(base_name) result[label_name] = { 'dir': dir_name, 'training': training_images, 'testing': testing_images, 'validation': validation_images } return result# 这个函数通过类别名称、所属数据集和图片编号获取一张图片的地址def get_image_path(image_lists, image_dir, label_name, index, category): """ :param image_lists:所有图片信息 :param image_dir:根目录 ( 图片特征向量根目录 CACHE_DIR | 图片原始路径根目录 INPUT_DATA ) :param label_name:类别的名称( daisy|dandelion|roses|sunflowers|tulips ) :param index:编号 :param category:所属的数据集( training|testing|validation ) :return: 一张图片的地址 """ # 获取给定类别的图片集合 label_lists = image_lists[label_name] # 获取这种类别的图片中,特定的数据集(base_name的一维数组) category_list = label_lists[category] mod_index = index % len(category_list) # 图片的编号%此数据集中图片数量 # 获取图片文件名 base_name = category_list[mod_index] sub_dir = label_lists['dir'] # 拼接地址 full_path = os.path.join(image_dir, sub_dir, base_name) return full_path# 图片的特征向量的文件地址def get_bottleneck_path(image_lists, label_name, index, category): return get_image_path(image_lists, CACHE_DIR, label_name, index, category) + '.txt' # CACHE_DIR 特征向量的根地址# 计算特征向量def run_bottleneck_on_image(sess, image_data, image_data_tensor, bottleneck_tensor): """ :param sess: :param image_data:图片内容 :param image_data_tensor: :param bottleneck_tensor: :return: """ # 由于输入的图片大小不一致,此处得到的image_data大小也不一致(已验证),但却都能通过加载的inception-v3模型生成一个2048的特征向量。具体原理不详。 bottleneck_values = sess.run(bottleneck_tensor, {image_data_tensor: image_data}) bottleneck_values = np.squeeze(bottleneck_values) return bottleneck_values# 获取一张图片对应的特征向量的路径def get_or_create_bottleneck(sess, image_lists, label_name, index, category, jpeg_data_tensor, bottleneck_tensor): """ :param sess: :param image_lists: :param label_name:类别名 :param index:图片编号 :param category: :param jpeg_data_tensor: :param bottleneck_tensor: :return: """ label_lists = image_lists[label_name] sub_dir = label_lists['dir'] sub_dir_path = os.path.join(CACHE_DIR, sub_dir) # 到类别的文件夹 if not os.path.exists(sub_dir_path): os.makedirs(sub_dir_path) bottleneck_path = get_bottleneck_path(image_lists, label_name, index, category) # 获取图片特征向量的路径 if not os.path.exists(bottleneck_path): # 如果不存在 # 获取图片原始路径 image_path = get_image_path(image_lists, INPUT_DATA, label_name, index, category) # 获取图片内容 image_data = gfile.FastGFile(image_path, 'rb').read() # 计算图片特征向量 bottleneck_values = run_bottleneck_on_image(sess, image_data, jpeg_data_tensor, bottleneck_tensor) # 将特征向量存储到文件 bottleneck_string = ','.join(str(x) for x in bottleneck_values) with open(bottleneck_path, 'w') as bottleneck_file: bottleneck_file.write(bottleneck_string) else: # 读取保存的特征向量文件 with open(bottleneck_path, 'r') as bottleneck_file: bottleneck_string = bottleneck_file.read() # 字符串转float数组 bottleneck_values = [float(x) for x in bottleneck_string.split(',')] return bottleneck_values# 随机获取一个batch的图片作为训练数据(特征向量,类别)def get_random_cached_bottlenecks(sess, n_classes, image_lists, how_many, category, jpeg_data_tensor, bottleneck_tensor): """ :param sess: :param n_classes: 类别数量 :param image_lists: :param how_many: 一个batch的数量 :param category: 所属的数据集 :param jpeg_data_tensor: :param bottleneck_tensor: :return: 特征向量列表,类别列表 """ bottlenecks = [] ground_truths = [] for _ in range(how_many): # 随机一个类别和图片编号加入当前的训练数据 label_index = random.randrange(n_classes) label_name = list(image_lists.keys())[label_index] # 随机图片的类别名 image_index = random.randrange(65536) # 随机图片的编号 bottleneck = get_or_create_bottleneck(sess, image_lists, label_name, image_index, category, jpeg_data_tensor, bottleneck_tensor) # 计算此图片的特征向量 ground_truth = np.zeros(n_classes, dtype=np.float32) ground_truth[label_index] = 1.0 bottlenecks.append(bottleneck) ground_truths.append(ground_truth) return bottlenecks, ground_truths# 获取全部的测试数据def get_test_bottlenecks(sess, image_lists, n_classes, jpeg_data_tensor, bottleneck_tensor): bottlenecks = [] ground_truths = [] label_name_list = list(image_lists.keys()) # ['dandelion', 'daisy', 'sunflowers', 'roses', 'tulips'] for label_index, label_name in enumerate(label_name_list): # 枚举每个类别,如:0 sunflowers category = 'testing' for index, unused_base_name in enumerate(image_lists[label_name][category]): # 枚举此类别中的测试数据集中的每张图片 bottleneck = get_or_create_bottleneck( sess, image_lists, label_name, index, category, jpeg_data_tensor, bottleneck_tensor) ground_truth = np.zeros(n_classes, dtype=np.float32) ground_truth[label_index] = 1.0 bottlenecks.append(bottleneck) ground_truths.append(ground_truth) return bottlenecks, ground_truthsdef main(_): image_lists = create_image_lists(TEST_PERCENTACE, VALIDATION_PERCENTAGE) n_classes = len(image_lists.keys()) # 读取模型 with gfile.FastGFile(os.path.join(MODEL_DIR, MODEL_FILE), 'rb') as f: graph_def = tf.GraphDef() graph_def.ParseFromString(f.read()) # 加载模型,返回对应名称的张量 bottleneck_tensor, jpeg_data_tensor = tf.import_graph_def(graph_def, return_elements=[BOTTLENECK_TENSOR_NAME, JPEG_DATA_TENSOR_NAME]) # 输入 bottleneck_input = tf.placeholder(tf.float32, [None, BOTTLENECK_TENSOR_SIZE], name='BottleneckInputPlaceholder') ground_truth_input = tf.placeholder(tf.float32, [None, n_classes], name='GroundTruthInput') # 全连接层 with tf.name_scope('final_training_ops'): weights = tf.Variable(tf.truncated_normal([BOTTLENECK_TENSOR_SIZE, n_classes], stddev=0.001)) biases = tf.Variable(tf.zeros([n_classes])) logits = tf.matmul(bottleneck_input, weights) + biases final_tensor = tf.nn.softmax(logits) # 损失 cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits, labels=ground_truth_input) cross_entropy_mean = tf.reduce_mean(cross_entropy) # 优化 train_step = tf.train.GradientDescentOptimizer(LEARNING_RATE).minimize(cross_entropy_mean) # 正确率 with tf.name_scope('evaluation'): correct_prediction = tf.equal(tf.argmax(final_tensor, 1), tf.argmax(ground_truth_input, 1)) evaluation_step = tf.reduce_mean(tf.cast(correct_prediction, tf.float32)) with tf.Session() as sess: # 初始化参数 init = tf.global_variables_initializer() sess.run(init) # TensorBoard log目录 # log_dir = 'inception_log' # if not os.path.exists(log_dir): # os.makedirs(log_dir) # tf.import_graph_def(graph_def, name='') # writer = tf.summary.FileWriter(log_dir, sess.graph) # writer.close() test_bottlenecks, test_ground_truth = get_test_bottlenecks(sess, image_lists, n_classes, jpeg_data_tensor, bottleneck_tensor) for i in range(STEPS): # 每次获取一个batch的训练数据 train_bottlenecks, train_ground_truth = get_random_cached_bottlenecks(sess, n_classes, image_lists, BATCH, 'training', jpeg_data_tensor, bottleneck_tensor) # 训练 sess.run(train_step, feed_dict={bottleneck_input: train_bottlenecks, ground_truth_input: train_ground_truth}) # 验证 if i % 50 == 0 or i + 1 == STEPS: validation_bottlenecks, validation_ground_truth = get_random_cached_bottlenecks(sess, n_classes, image_lists, BATCH, 'validation', jpeg_data_tensor, bottleneck_tensor) validation_accuracy = sess.run(evaluation_step, feed_dict={bottleneck_input: validation_bottlenecks, ground_truth_input: validation_ground_truth}) print('Step %d: Validation accuracy on random sampled %d examples = %.1f%%' % ( i, BATCH, validation_accuracy * 100)) if validation_accuracy > 0.95: # 测试 test_accuracy = sess.run(evaluation_step, feed_dict={bottleneck_input: test_bottlenecks, ground_truth_input: test_ground_truth}) print('Final test accuracy = %.1f%%' % (test_accuracy * 100))if __name__ == '__main__': tf.app.run()
实验结果
一、clasify_flower_float预测数据的准确率最好在80%左右。
1.图片处理:
a.图片使用先pad后resize保证图片不会发生形变。 b.图片数据进行归一化到[0,1)。
2.模型修改:
a.所有的卷积使用 3 * 3。 b.增加一个卷积。 c.最后的pooling使用avg_pooling,pool_size=[4, 4], strides=4 (可以大大减少Size)。 d.去掉一个全连接 剩余两个神经元个数为 512 和 5 。 e.增加一个dropout 百分比为0.6
二、flower_classify_with_data_enhance准确率最好在 90%左右
1.数据增强
a.5倍大小。3900*5 = 19500 (中心剪裁,左右旋转、色彩变换)b.取17200个作为训练样本,2000个作为预测样本。
2.模型与上面基本相似。
三、fine_tuning_inception_v3准备率最好在 96% 左右。google inception_v3 进行 fine_train
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