Tensorflow 提高测试准确性

Question

各位，我是tensorflow新手，刚开始学才2天。我按照tensorflow的步骤制作，注意代码的含义。之后我尝试做类似的项目，就像我在 tensorflow 教程中所做的那样。

由于刚好2天，尝试做了一个图片分类。但是测试结果的准确性太差，没有做出真正的评价。

能否请您指导，教我如何改进此代码或我应该学习什么来改进此代码...

备注： -我在colabs.google做了项目（你可以在这里复制代码试试） -我取过的数据集===> https://www.cs.toronto.edu/~kriz/cifar.html

这是我的代码：

import tensorflow as tf

from tensorflow import keras

import numpy as np

import matplotlib.pyplot as plt

(train_i, train_l), (test_i, test_l) = tf.keras.datasets.cifar10.load_data()

classnames = ['airplane', 'automobile', 'bird', 'cat', 'deer', 'dog', 'frog', 'horse', 'ship', 'truck']

model = models.Sequential()
model.add(layers.Conv2D(32, (3, 3), activation='relu'))
model.add(layers.MaxPooling2D((2, 2)))

model = keras.Sequential([    
    keras.layers.Flatten(),
    keras.layers.Dense(100, activation='relu'), #burada kaç tane node olacağını belirtiyoruz yani mesela burada 108 se 108 tane node vardır. Node sayısını arrtırdıkça işlem hızımız düşüyor ama tahmin değerlerimiz gerçeğe daha yakın oluyor.
    keras.layers.Dense(10) #burada ise 10 diyoruz çünkü 10 tane class içinden seçecek.
])
model.compile(optimizer='adam',
              loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True),
              metrics=['accuracy'])

model.fit(train_i, train_l, epochs=100)

test_loss, test_acc = model.evaluate(test_i,  test_l, verbose=2)
print(test_acc)
prediction = tf.keras.Sequential([model, tf.keras.layers.Softmax()]).predict(test_i)

i = 90

prediction[i]

prediction_made= np.argmax(prediction[i])

f= train_l[i]

s=str(train_l[i])
print(str(s)[1:-1])

b = int(str(s)[1:-1])

y = classnames[b]

x = classnames[prediction_made]

img = train_i
plt.grid(False)
plt.xticks([]) 
plt.yticks([]) 
plt.imshow(img[i])

plt.xlabel('The True Label is ' + repr(y) + 
           ', and The Predicted Label is ' + repr(x) + '...')

Answer 1

你的'model'被证明了两次。

models.Sequential() ...
模型 = keras.Sequential(...)

因此第一部分未包含在最终 'model' 中。

像这样修改模型部分代码

model = keras.Sequential([  
   keras.layers.Conv2D(32, (3, 3), activation='relu', input_shape=(32, 32 ,3)),
   keras.layers.MaxPooling2D((2, 2)),                     
   keras.layers.Flatten(),
   keras.layers.Dense(100, activation='relu'),
   keras.layers.Dense(10)
])

Tensorflow 提高测试准确性

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keras

tensorflow2.0