如何解决ValueError:sequence_16层的输入0与该层不兼容:预期ndim = 5,找到的ndim = 4收到完整的形状:[无,224,224,3]
我正在通过MobileNet使用转移学习,然后将提取的功能发送到LSTM进行视频数据分类。
当我使用image_dataset_from_directory()设置训练,测试,验证数据集时,图像的大小调整为(224,224)。
编辑: 因此,我需要填充数据序列,但是这样做时会出现以下错误,我不太确定在使用image_dataset_from_directory()时该怎么做:
train_dataset = sequence.pad_sequences(train_dataset,maxlen=BATCH_SIZE,padding="post",truncating="post")
InvalidArgumentError: assertion failed: [Unable to decode bytes as JPEG,PNG,GIF,or BMP]
[[{{node decode_image/cond_jpeg/else/_1/decode_image/cond_jpeg/cond_png/else/_20/decode_image/cond_jpeg/cond_png/cond_gif/else/_39/decode_image/cond_jpeg/cond_png/cond_gif/Assert/Assert}}]] [Op:IteratorGetNext]
我检查了train_dataset类型:
<BatchDataset shapes: ((None,None,224,3),(None,None)),types: (tf.float32,tf.int32)>
全局变量:
TARGETX = 224
TARGETY = 224
CLASSES = 3
SIZE = (TARGETX,TARGETY)
INPUT_SHAPE = (TARGETX,TARGETY,3)
CHANNELS = 3
NBFRAME = 5
INSHAPE = (NBFRAME,TARGETX,3)
移动网络功能:
def build_mobilenet(shape=INPUT_SHAPE,nbout=CLASSES):
# INPUT_SHAPE = (224,3)
# CLASSES = 3
model = MobileNetV2(
include_top=False,input_shape=shape,weights='imagenet')
base_model.trainable = True
output = GlobalMaxPool2D()
return Sequential([model,output])
LSTM功能:
def action_model(shape=INSHAPE,nbout=3):
# INSHAPE = (5,3)
convnet = build_mobilenet(shape[1:])
model = Sequential()
model.add(TimeDistributed(convnet,input_shape=shape))
model.add(LSTM(64))
model.add(Dense(1024,activation='relu'))
model.add(Dropout(.5))
model.add(Dense(512,activation='relu'))
model.add(Dropout(.5))
model.add(Dense(128,activation='relu'))
model.add(Dropout(.5))
model.add(Dense(64,activation='relu'))
model.add(Dense(nbout,activation='softmax'))
return model
model = action_model(INSHAPE,CLASSES)
model.summary()
Model: "sequential_16"
_________________________________________________________________
Layer (type) Output Shape Param #
=================================================================
time_distributed_6 (TimeDist (None,5,1280) 2257984
_________________________________________________________________
lstm_5 (LSTM) (None,64) 344320
_________________________________________________________________
dense_45 (Dense) (None,1024) 66560
_________________________________________________________________
dropout_18 (Dropout) (None,1024) 0
_________________________________________________________________
dense_46 (Dense) (None,512) 524800
_________________________________________________________________
dropout_19 (Dropout) (None,512) 0
_________________________________________________________________
dense_47 (Dense) (None,128) 65664
_________________________________________________________________
dropout_20 (Dropout) (None,128) 0
_________________________________________________________________
dense_48 (Dense) (None,64) 8256
_________________________________________________________________
dense_49 (Dense) (None,3) 195
=================================================================
Total params: 3,267,779
Trainable params: 3,233,667
Non-trainable params: 34,112
解决方法
您的模型很好。问题是您提供数据的方式。
您的型号代码:
import tensorflow as tf
import keras
from keras.layers import GlobalMaxPool2D,TimeDistributed,Dense,Dropout,LSTM
from keras.applications import MobileNetV2
from keras.models import Sequential
import numpy as np
from keras.preprocessing.sequence import pad_sequences
TARGETX = 224
TARGETY = 224
CLASSES = 3
SIZE = (TARGETX,TARGETY)
INPUT_SHAPE = (TARGETX,TARGETY,3)
CHANNELS = 3
NBFRAME = 5
INSHAPE = (NBFRAME,TARGETX,3)
def build_mobilenet(shape=INPUT_SHAPE,nbout=CLASSES):
# INPUT_SHAPE = (224,224,3)
# CLASSES = 3
model = MobileNetV2(
include_top=False,input_shape=shape,weights='imagenet')
model.trainable = True
output = GlobalMaxPool2D()
return Sequential([model,output])
def action_model(shape=INSHAPE,nbout=3):
# INSHAPE = (5,3)
convnet = build_mobilenet(shape[1:])
model = Sequential()
model.add(TimeDistributed(convnet,input_shape=shape))
model.add(LSTM(64))
model.add(Dense(1024,activation='relu'))
model.add(Dropout(.5))
model.add(Dense(512,activation='relu'))
model.add(Dropout(.5))
model.add(Dense(128,activation='relu'))
model.add(Dropout(.5))
model.add(Dense(64,activation='relu'))
model.add(Dense(nbout,activation='softmax'))
return model
现在让我们使用一些虚拟数据尝试该模型:
因此,您的模型接受一系列图像(即视频帧)并将它们(视频)分类为3类之一。
让我们创建一个虚拟数据,每个数据包含10帧的4个视频,即批量大小= 4和时间步长= 10
X = np.random.randn(4,10,3)
y = model(X)
print (y.shape)
输出:
(4,3)
按预期,输出大小为(4,3)
现在,使用image_dataset_from_direcctory
时您将面临的问题是如何批处理可变长度的视频,因为每个视频中的帧数可能会变化。处理它的方法是使用pad_sequences
。
例如,如果第一段视频有10帧,第二段视频有9帧,依此类推,您可以执行以下操作
X = [np.random.randn(10,3),np.random.randn(9,np.random.randn(8,np.random.randn(7,3)]
X = pad_sequences(X)
y = model(X)
print (y.shape)
输出:
(4,3)
因此,一旦您使用image_dataset_from_direcctory
读取图像,就必须将可变长度的帧分批填充。
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