我正在尝试遵循Mouse Connectivity sdk并让他们的两个示例正常工作。
pd返回无或所有投影信号密度实验。为什么会这样？
from allensdk.api.queries.mouse_connectivity_api import MouseConnectivityApi
mca = MouseConnectivityApi()
# get metadata for all non-Cre experiments
experiments = mca.experiment_source_search(injection_structures='root', transgenic_lines=0)
# download the projection density volume for one of the experiments
#pd = mca.download_projection_density('example.nrrd', experiments[0]['id'], resolution=25)
for exp in range(len(experiments)):
pd = mca.download_projection_density('example.nrrd', experiments[exp]['id'], resolution=25)
print(type(pd))
结果：
C:\Anaconda\python.exe C:/Users/user/PycharmProjects/MyFirstAllenBrain/Test.py
<type 'NoneType'>
<type 'NoneType'>
<type 'NoneType'>
<type 'NoneType'>
<type 'NoneType'>
<type 'NoneType'>
... etc
但问题是，它experiments确实收到了一个值，所以看来 MouseConnectivityApi 和 nrrd（我根据以下帖子安装）工作正常。
看这里：
对，现在是第二个例子
from allensdk.core.mouse_connectivity_cache import MouseConnectivityCache
# tell the cache class what resolution (in microns) of data you want to download
mcc = MouseConnectivityCache(resolution=25)
# use the ontology class to get the id of the isocortex structure
ontology = mcc.get_ontology()
isocortex = ontology['Isocortex']
# a list of dictionaries containing metadata for non-Cre experiments
experiments = mcc.get_experiments(injection_structure_ids=isocortex['id'])
# download the projection density volume for one of the experiments
pd = mcc.get_projection_density(experiments[0]['id'])
这是从艾伦逐字复制的，但这是我得到的错误消息：
C:\Anaconda\python.exe C:/Users/user/PycharmProjects/MyFirstAllenBrain/Test.py
Traceback (most recent call last):
File "C:/Users/user/PycharmProjects/MyFirstAllenBrain/Test.py", line 14, in <module>
pd = mcc.get_projection_density(experiments[0]['id'])
File "C:\Users\user\AppData\Roaming\Python\Python27\site-packages\allensdk\core\mouse_connectivity_cache.py", line 170, in get_projection_density
return nrrd.read(file_name)
File "C:\Anaconda\lib\site-packages\nrrd.py", line 384, in read
data = read_data(header, filehandle, filename)
File "C:\Anaconda\lib\site-packages\nrrd.py", line 235, in read_data
mmap.MAP_PRIVATE, mmap.PROT_READ)
AttributeError: 'module' object has no attribute 'MAP_PRIVATE'
Process finished with exit code 1
为什么会发生这种情况？
和以前一样（我假设不需要另一张图片），experiments变量确实收到了每个实验的值。