Jupyter Notebook執行程式碼無反應問題及解決方法

Jupyter Notebook執行程式碼無反應

在學習臉部辨識知識的過程中需要用到Anaconda 、Jupyter Notebook.

我在啟動Jupyter Notebook後，新建程式碼執行無反應。

從頁面上也觀察不出來是什麼問題，後來在Anaconda Pormpt中啟動Jupyter Notebook，我一開始還以為是自動啟動的，傻傻的等它自動執行。。。

結果是在瀏覽器中操作，命令列中才會跑模組的執行情況。

要在瀏覽器中shift+enter執行程式碼片段，後臺包這個錯誤。

 
(tensorflow) C:Usersadmin>jupyter notebook
[I 15:55:33.979 NotebookApp] The port 8888 is already in use, trying another port.
[I 15:55:34.011 NotebookApp] The port 8889 is already in use, trying another port.
[I 15:55:34.130 NotebookApp] Serving notebooks from local directory: C:Usersadmin
[I 15:55:34.131 NotebookApp] The Jupyter Notebook is running at:
[I 15:55:34.137 NotebookApp] http://localhost:8890/?token=7d8aff641154f969e61dec8ebd511d98849f08829e440fe0
[I 15:55:34.139 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 15:55:34.220 NotebookApp]
 
    To access the notebook, open this file in a browser:
        file:///C:/Users/admin/AppData/Roaming/jupyter/runtime/nbserver-24428-open.html
    Or copy and paste one of these URLs:
        http://localhost:8890/?token=7d8aff641154f969e61dec8ebd511d98849f08829e440fe0
Traceback (most recent call last):
  File "C:UsersadminAnaconda3envstensorflowlibsite-packagestornadoioloop.py", line 888, in start
    handler_func(fd_obj, events)
  File "C:UsersadminAnaconda3envstensorflowlibsite-packagestornadostack_context.py", line 277, in null_wrapper
    return fn(*args, **kwargs)
  File "C:UsersadminAnaconda3envstensorflowlibsite-packageszmqeventloopzmqstream.py", line 450, in _handle_events
    self._handle_recv()
  File "C:UsersadminAnaconda3envstensorflowlibsite-packageszmqeventloopzmqstream.py", line 480, in _handle_recv
    self._run_callback(callback, msg)
  File "C:UsersadminAnaconda3envstensorflowlibsite-packageszmqeventloopzmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
  File "C:UsersadminAnaconda3envstensorflowlibsite-packagestornadostack_context.py", line 277, in null_wrapper
    return fn(*args, **kwargs)
  File "C:UsersadminAnaconda3envstensorflowlibsite-packagesipykernelkernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
  File "C:UsersadminAnaconda3envstensorflowlibsite-packagesipykernelkernelbase.py", line 233, in dispatch_shell
    self.pre_handler_hook()
  File "C:UsersadminAnaconda3envstensorflowlibsite-packagesipykernelkernelbase.py", line 248, in pre_handler_hook
    self.saved_sigint_handler = signal(SIGINT, default_int_handler)
  File "C:UsersadminAnaconda3envstensorflowlibsignal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread
[IPKernelApp] WARNING | Parent appears to have exited, shutting down.

然後參考https://www.jb51.net/article/271651.htm  解決。

(tensorflow) C:Usersadmin>pip install "pyzmq==17.0.0" "ipykernel==4.8.2"
Collecting pyzmq==17.0.0
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)",)': /simple/pyzmq/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)",)': /simple/pyzmq/
  Downloading https://files.pythonhosted.org/packages/27/0b/a275f30738a014dc25443d2f45156ca739991df581fdaa40aa19df6c4f86/pyzmq-17.0.0-cp36-cp36m-win_amd64.whl (944kB)
    100% |████████████████████████████████| 952kB 49kB/s
Collecting ipykernel==4.8.2
  Downloading https://files.pythonhosted.org/packages/ab/3f/cd624c835aa3336a9110d0a99e15070f343b881b7d651ab1375ef226a3ac/ipykernel-4.8.2-py3-none-any.whl (108kB)
    100% |████████████████████████████████| 112kB 58kB/s
Requirement already satisfied: ipython>=4.0.0 in c:usersadminanaconda3envstensorflowlibsite-packages (from ipykernel==4.8.2) (6.1.0)
Requirement already satisfied: tornado>=4.0 in c:usersadminanaconda3envstensorflowlibsite-packages (from ipykernel==4.8.2) (4.5.2)
Requirement already satisfied: traitlets>=4.1.0 in c:usersadminanaconda3envstensorflowlibsite-packages (from ipykernel==4.8.2) (4.3.2)
Requirement already satisfied: jupyter-client in c:usersadminanaconda3envstensorflowlibsite-packages (from ipykernel==4.8.2) (5.2.4)
Requirement already satisfied: jupyter-core in c:usersadminanaconda3envstensorflowlibsite-packages (from jupyter-client->ipykernel==4.8.2) (4.4.0)
Requirement already satisfied: python-dateutil>=2.1 in c:usersadminanaconda3envstensorflowlibsite-packages (from jupyter-client->ipykernel==4.8.2) (2.6.1)
Requirement already satisfied: six>=1.5 in c:usersadminanaconda3envstensorflowlibsite-packages (from python-dateutil>=2.1->jupyter-client->ipykernel==4.8.2) (1.10.0)
Installing collected packages: pyzmq, ipykernel
  Found existing installation: pyzmq 17.1.2
    Uninstalling pyzmq-17.1.2:
      Successfully uninstalled pyzmq-17.1.2
  Found existing installation: ipykernel 4.6.1
Cannot uninstall 'ipykernel'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

安裝時報錯，ipykernel不能解除安裝，我也嘗試過重新裝，一直報這個錯誤。索性沒管它，直接再瀏覽器中重新執行就可以正常執行了。

這是修復後的執行效果。

jupyter notebook 某個cell 一直在執行

近期偵錯程式，發現一簡單的程式碼一直在執行，很長時間不終止，程式碼如下：

whole_df=pd.read_csv(r'./train.csv')
 
community=whole_df['COMMUNITY_ID'].unique()
 
for community_id in community:
 
    temp=check_result[check_result['COMMUNITY_ID']==community_id]
 
    start=temp.index.tolist()[0]
 
    delanomaly_test(temp,start) 

其中delanomaly_test 是對測試資料進行處理異常值的函數，函數裡有對形參temp進行賦值的操作，而temp 是whole_df的切片，執行後，出現了很多提示：

/usr/local/python3/lib/python3.6/site-packages/pandas/core/indexing.py:1763: SettingWithCopyWarning:

A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead

See the caveats in the documentation: https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#returning-a-view-versus-a-copy

一大串的全是提示，而且還一直擴充套件向下，過了10分鐘，不再出現提示，但是這段cell 執行符號裡顯示‘*’，為一直在執行，本身資料量不大，community 為200個,check_result為8萬條，應該2、3分鐘就結束了但是又過5分鐘還是‘*’號，點‘Interrupt the kernel ’也是很長時間沒反應。用寫標準輸出+寫檔案的方式測試下：

whole_df=pd.read_csv(r'./train.csv')
 
community=whole_df['COMMUNITY_ID'].unique()
filename='proeceeing.txt'
 
with open(file_name,'w+') as f:
 
    f.write(file_name)
 
w=0 #進度的變數
 
for community_id in community:
 
    if w%50==0:
 
        print('w=%s' %str(w)) #列印至標準輸出
 
        f=open(file_name,'a')
 
        f.write('n     '+str(w)+':')#寫入檔案
 
        f.write(time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())))  
 
        f.close()
 
    temp=check_result[check_result['COMMUNITY_ID']==community_id]
 
    start=temp.index.tolist()[0]
 
    delanomaly_test(temp,start)
 
    w=w+1
print('w=%s' %str(w)) #列印至標準輸出
 
f=open(file_name,'a')
 
print('w=%s' %str(w))
 
f.write('n     '+str(w)+':') #寫入檔案
 
f.write(time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())))
 
f.write('n check_result executed ')
 
f.close()

執行後，檔案內容如下：

processing.txt
     0:2021-08-25 21:14:38
     50:2021-08-25 21:14:43
     100:2021-08-25 21:14:49
     150:2021-08-25 21:14:54
     200:2021-08-25 21:15:00
 check_result executed 

看來這段程式碼在一分鐘之內已經執行完畢，再看標準輸出，還是有很多之前的提示，同時標示進度的w值裡，只發現了三條：

w=0

w=50

w=100

再向後就只有提示，再向後提示也終止了

因此這段程式碼一直執行的可能原因是短時間內寫大量內容至標準輸出，標準輸出緩衝區滿，無法列印提示和之後的內容，但程式實際已執行完畢。最後刪除delanomaly_test 函數裡的切片賦值語句，發現這段程式碼很快結束，至此問題有三個：切片不可直接賦值，標準輸出不可靠，每個提示都要細看

總結

以上為個人經驗，希望能給大家一個參考，也希望大家多多支援it145.com。