我已经遵循了[[link] tutorial（https://pythonprogramming.net/introduction-use-tensorflow-object-detection-api-tutorial/），并进入了最后一步，在该步骤中，我运行python文件以检测图像中的对象。我试图检测图像中的对象，最终要检测到相机流中的对象，但是这变得越来越困难，起初我以为我可能是在我的朋友的笔记本电脑上尝试安装某些东西而使下载混乱，并且看起来工作得很好。这是我的错误：
from utils import label_map_util
from utils import visualization_utils as vis_util
utils/visualization_utils.py:23: UserWarning:
This call to matplotlib.use() has no effect because the backend has already
been chosen; matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.
The backend was *originally* set to 'module://ipykernel.pylab.backend_inline' by the following code:
File "/usr/lib64/python2.7/runpy.py", line 174, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "/usr/lib64/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/usr/lib/python2.7/site-packages/ipykernel_launcher.py", line 16, in <module>
app.launch_new_instance()
File "/usr/lib/python2.7/site-packages/traitlets/config/application.py", line 658, in launch_instance
app.start()
File "/usr/lib/python2.7/site-packages/ipykernel/kernelapp.py", line 499, in start
self.io_loop.start()
File "/usr/lib64/python2.7/site-packages/tornado/ioloop.py", line 1017, in start
self._run_callback(self._callbacks.popleft())
File "/usr/lib64/python2.7/site-packages/tornado/ioloop.py", line 758, in _run_callback
ret = callback()
File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
return fn(*args, **kwargs)
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 542, in <lambda>
self.io_loop.add_callback(lambda : self._handle_events(self.socket, 0))
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 456, in _handle_events
self._handle_recv()
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 486, in _handle_recv
self._run_callback(callback, msg)
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 438, in _run_callback
callback(*args, **kwargs)
File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
return fn(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/ipykernel/kernelbase.py", line 283, in dispatcher
return self.dispatch_shell(stream, msg)
File "/usr/lib/python2.7/site-packages/ipykernel/kernelbase.py", line 233, in dispatch_shell
handler(stream, idents, msg)
File "/usr/lib/python2.7/site-packages/ipykernel/kernelbase.py", line 399, in execute_request
user_expressions, allow_stdin)
File "/usr/lib/python2.7/site-packages/ipykernel/ipkernel.py", line 208, in do_execute
res = shell.run_cell(code, store_history=store_history, silent=silent)
File "/usr/lib/python2.7/site-packages/ipykernel/zmqshell.py", line 537, in run_cell
return super(ZMQInteractiveShell, self).run_cell(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2714, in run_cell
interactivity=interactivity, compiler=compiler, result=result)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2824, in run_ast_nodes
if self.run_code(code, result):
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2878, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-2-48fe9407af3a>", line 2, in <module>
get_ipython().magic(u'matplotlib inline')
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2160, in magic
return self.run_line_magic(magic_name, magic_arg_s)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2081, in run_line_magic
result = fn(*args,**kwargs)
File "<decorator-gen-105>", line 2, in matplotlib
File "/usr/lib/python2.7/site-packages/IPython/core/magic.py", line 188, in <lambda>
call = lambda f, *a, **k: f(*a, **k)
File "/usr/lib/python2.7/site-packages/IPython/core/magics/pylab.py", line 100, in matplotlib
gui, backend = self.shell.enable_matplotlib(args.gui)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2966, in enable_matplotlib
pt.activate_matplotlib(backend)
File "/usr/lib/python2.7/site-packages/IPython/core/pylabtools.py", line 315, in activate_matplotlib
matplotlib.pyplot.switch_backend(backend)
File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py", line 231, in switch_backend
matplotlib.use(newbackend, warn=False, force=True)
File "/usr/lib64/python2.7/site-packages/matplotlib/__init__.py", line 1422, in use
reload(sys.modules['matplotlib.backends'])
File "/usr/lib64/python2.7/site-packages/matplotlib/backends/__init__.py", line 17, in <module>
line for line in traceback.format_stack()
matplotlib.use('Agg')
utils/visualization_utils.py:31: UserWarning:
This call to matplotlib.use() has no effect because the backend has already
been chosen; matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.
The backend was *originally* set to 'module://ipykernel.pylab.backend_inline' by the following code:
File "/usr/lib64/python2.7/runpy.py", line 174, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "/usr/lib64/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/usr/lib/python2.7/site-packages/ipykernel_launcher.py", line 16, in <module>
app.launch_new_instance()
File "/usr/lib/python2.7/site-packages/traitlets/config/application.py", line 658, in launch_instance
app.start()
File "/usr/lib/python2.7/site-packages/ipykernel/kernelapp.py", line 499, in start
self.io_loop.start()
File "/usr/lib64/python2.7/site-packages/tornado/ioloop.py", line 1017, in start
self._run_callback(self._callbacks.popleft())
File "/usr/lib64/python2.7/site-packages/tornado/ioloop.py", line 758, in _run_callback
ret = callback()
File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
return fn(*args, **kwargs)
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 542, in <lambda>
self.io_loop.add_callback(lambda : self._handle_events(self.socket, 0))
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 456, in _handle_events
self._handle_recv()
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 486, in _handle_recv
self._run_callback(callback, msg)
File "/usr/lib64/python2.7/site-packages/zmq/eventloop/zmqstream.py", line 438, in _run_callback
callback(*args, **kwargs)
File "/usr/lib64/python2.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
return fn(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/ipykernel/kernelbase.py", line 283, in dispatcher
return self.dispatch_shell(stream, msg)
File "/usr/lib/python2.7/site-packages/ipykernel/kernelbase.py", line 233, in dispatch_shell
handler(stream, idents, msg)
File "/usr/lib/python2.7/site-packages/ipykernel/kernelbase.py", line 399, in execute_request
user_expressions, allow_stdin)
File "/usr/lib/python2.7/site-packages/ipykernel/ipkernel.py", line 208, in do_execute
res = shell.run_cell(code, store_history=store_history, silent=silent)
File "/usr/lib/python2.7/site-packages/ipykernel/zmqshell.py", line 537, in run_cell
return super(ZMQInteractiveShell, self).run_cell(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2714, in run_cell
interactivity=interactivity, compiler=compiler, result=result)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2824, in run_ast_nodes
if self.run_code(code, result):
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2878, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "<ipython-input-2-48fe9407af3a>", line 2, in <module>
get_ipython().magic(u'matplotlib inline')
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2160, in magic
return self.run_line_magic(magic_name, magic_arg_s)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2081, in run_line_magic
result = fn(*args,**kwargs)
File "<decorator-gen-105>", line 2, in matplotlib
File "/usr/lib/python2.7/site-packages/IPython/core/magic.py", line 188, in <lambda>
call = lambda f, *a, **k: f(*a, **k)
File "/usr/lib/python2.7/site-packages/IPython/core/magics/pylab.py", line 100, in matplotlib
gui, backend = self.shell.enable_matplotlib(args.gui)
File "/usr/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2966, in enable_matplotlib
pt.activate_matplotlib(backend)
File "/usr/lib/python2.7/site-packages/IPython/core/pylabtools.py", line 315, in activate_matplotlib
matplotlib.pyplot.switch_backend(backend)
File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py", line 231, in switch_backend
matplotlib.use(newbackend, warn=False, force=True)
File "/usr/lib64/python2.7/site-packages/matplotlib/__init__.py", line 1422, in use
reload(sys.modules['matplotlib.backends'])
File "/usr/lib64/python2.7/site-packages/matplotlib/backends/__init__.py", line 17, in <module>
line for line in traceback.format_stack()
import matplotlib; matplotlib.use('Agg') # pylint: disable=multiple-statements
任何帮助：万分感谢。