[英]Write custom Data Generator for Keras
I have each datapoint stored in a .npy file, with shape=(1024,7,8)
.我将每个数据点存储在一个 .npy 文件中,
shape=(1024,7,8)
。 I want to load them to a Keras model by a manner similar to ImageDataGenerator
, so I wrote and tried different custom generators but none of them work, here is one I adapted from this我想将它们加载到通过类似的方式Keras模型
ImageDataGenerator
,所以我写和尝试不同的自定义的发电机,但他们没有工作,这里是一个我改编自这
def find(dirpath, prefix=None, suffix=None, recursive=True):
"""Function to find recursively all files with specific prefix and suffix in a directory
Return a list of paths
"""
l = []
if not prefix:
prefix = ''
if not suffix:
suffix = ''
for (folders, subfolders, files) in os.walk(dirpath):
for filename in [f for f in files if f.startswith(prefix) and f.endswith(suffix)]:
l.append(os.path.join(folders, filename))
if not recursive:
break
l
return l
def generate_data(directory, batch_size):
i = 0
file_list = find(directory)
while True:
array_batch = []
for b in range(batch_size):
if i == len(file_list):
i = 0
random.shuffle(file_list)
sample = file_list[i]
i += 1
array = np.load(sample)
array_batch.append(array)
yield array_batch
I found this lacks of the label, so it won't be fit into the model using fit_generator
.我发现这缺少标签,因此它不适合使用
fit_generator
的模型。 How can I add the label into this generator, given that I can store them in a numpy array?考虑到我可以将标签存储在 numpy 数组中,如何将标签添加到此生成器中?
from tensorflow.python.keras.utils import Sequence
import numpy as np
class Mygenerator(Sequence):
def __init__(self, x_set, y_set, batch_size):
self.x, self.y = x_set, y_set
self.batch_size = batch_size
def __len__(self):
return int(np.ceil(len(self.x) / float(self.batch_size)))
def __getitem__(self, idx):
batch_x = self.x[idx * self.batch_size:(idx + 1) * self.batch_size]
batch_y = self.y[idx * self.batch_size:(idx + 1) * self.batch_size]
# read your data here using the batch lists, batch_x and batch_y
x = [my_readfunction(filename) for filename in batch_x]
y = [my_readfunction(filename) for filename in batch_y]
return np.array(x), np.array(y)
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