I am trying to use VGG16
in a model but I got an error when calling fit
.
ValueError: Input 0 of layer "sequential_1" is incompatible with the layer: expected shape=(None, 363, 360, 3), found shape=(363, 360, 3)
I am using tfds
to load images from folders.
builder = tfds.ImageFolder(PATH, shape=(363,360,3))
print(builder.info)
train_ds, test_ds = builder.as_dataset(split=['train','test'], shuffle_files=True, as_supervised=True,)
The output is as follows.
tfds.core.DatasetInfo(
name='image_folder',
full_name='image_folder/1.0.0',
description="""
Generic image classification dataset.
""",
homepage='https://www.tensorflow.org/datasets/catalog/image_folder',
data_path='/root/tensorflow_datasets/image_folder/1.0.0',
file_format=tfrecord,
download_size=Unknown size,
dataset_size=Unknown size,
features=FeaturesDict({
'image': Image(shape=(363, 360, 3), dtype=tf.uint8),
'image/filename': Text(shape=(), dtype=tf.string),
'label': ClassLabel(shape=(), dtype=tf.int64, num_classes=8),
}),
supervised_keys=('image', 'label'),
disable_shuffling=False,
splits={
'test': <SplitInfo num_examples=1712, num_shards=1>,
'train': <SplitInfo num_examples=15380, num_shards=1>,
},
citation="""""",
)
The model is created using the following code.
IMG_SHAPE = (363, 360, 3)
VGG16_MODEL = tf.keras.applications.VGG16(input_shape=IMG_SHAPE,
include_top=False,
weights='imagenet')
VGG16_MODEL.trainable = False
global_average_layer = tf.keras.layers.GlobalAveragePooling2D()
prediction_layer = tf.keras.layers.Dense(len(CLASS_NAMES), activation='softmax')
model = tf.keras.Sequential([
VGG16_MODEL,
global_average_layer,
prediction_layer
])
model.compile(optimizer=tf.keras.optimizers.Adam(),
loss=tf.keras.losses.sparse_categorical_crossentropy,
metrics=["accuracy"])
A problem occurs when I tried to fit the model.
history = model.fit(train_ds, epochs=100,)
You seem to have forgotten to set the batch size:
history = model.fit(train_ds.batch(32), epochs=100,)
builder.as_dataset
constructs a tf.data.Dataset
, so you need to call train_ds.batch(your_batch_size)
. See here for more information on this.