我想删除90%的"转向"值等于0的行。这三个图像都有一个对应的图像文件,中间,左边和右边。我也要删除它们。csv文件如下:
我编写了以下代码,以至少获取转向值为0的文件。我所需要的就是随机获取90%的文件并删除它们的代码。
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18with open('data/driving_log.csv') as csvfile:
reader = csv.reader(csvfile)
for i,line in enumerate(reader):
lines.append(line)
index.append(i)
lines = np.delete(lines,(0), axis = 0)
for i, line in enumerate(lines):
#print(type(line[3].astype(np.float)))
line_no.append(line[3].astype(np.float32))
#print(line_no[i])
if line_no[i]==0.0:
# this gets the first column of the row.
for j in range(3):
source_path = line[j]
filename = source_path.split('/')[-1]
print(filename)
count += 1
您是否搜索过如何在python中生成随机数和删除文件?生成随机数。删除文件。
是的,我需要随机导入并使用os.remove()删除文件。但是,我在两个地方感到困惑,从csv文件中删除一行,随机删除90%的转向值等于0的文件。
你能把你的csv文件的一部分以文本格式发布吗?最好用逗号作为分隔符。
而且,您的代码是不完整的。很多未定义的变量。
img/中_2016_12_01_13_30_48_287.jpg,img/左_2016_12_01_13_48_287.jpg,img/右_2016_12_01_13_48_287.jpg,0,0,0,22.14829。
我添加了代码开始工作的部分。在此之前,它只是导入包并初始化变量。
我认为这会满足你的需求:
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39import csv
from random import randint
from os import remove
# Create a 2D list from which we can work with
lines = []
with open('data/driving_log.csv', newline='') as csvfile:
reader = csv.reader(csvfile)
for line in reader:
lines.append(line)
# Find 10% of total lines (to keep), not including header row
numToKeep = round(sum(1 for i in lines if i[3] == '0') * 0.1)
# Save 10% of lines to a new 2D list
toKeep = []
for i in range(numToKeep):
while True:
index = randint(1, len(lines)-1)
# Make sure we haven't already selected the same line
if lines[index] not in toKeep and lines[index][3] == '0':
toKeep.append(lines[index])
break
# Deleting all files of the selected 90% of rows
for i, line in enumerate(lines):
if i == 0: # Omit the header row
continue
if lines[i][3] != '0': # Keep rows that don't have a steering value of 0
toKeep.append(lines[i])
if line not in toKeep:
print("Deleting: {}".format(line))
for i in range(3):
remove(line[i])
with open('data/driving_log.csv', 'w', newline='') as csvfile:
writer = csv.writer(csvfile)
writer.writerows([lines[0]]) # Put the header back in
writer.writerows(toKeep)
我意识到这不是最优雅的解决方案。我对numpy不熟悉,现在也没有时间去学习,但这应该管用。
嘿,谢谢你。但我看不出转向角需要为0的条件。另外,我还想删除相应的文件。就像我想删除img文件夹中的center_2016_12_01_13_30_48_287.jpg。你能帮我做这两件事吗?
这行if lines[index] not in toKeep and lines[index][3] == '0':指出,如果我们还没有将该行添加到要保留的行列表中,并且如果转向柱等于0,那么……
这些行:for i in range(3):和remove(line[i])将删除该行的3个文件中的每一个。