ValueError: Expected 2D array, got 1D array instead:

by

You need to give both the fit and predict methods 2D arrays. Your x_train and x_test are currently only 1 dimensional. What is suggested by the console should work:

x_train= x_train.reshape(-1, 1)
x_test = x_test.reshape(-1, 1)

This uses numpy’s reshape to transform your array. For example, x = [1, 2, 3] wopuld be transformed to a matrix x' = [[1], [2], [3]] (-1 gives the x dimension of the matrix, inferred from the length of the array and remaining dimensions, 1 is the y dimension – giving us a n x 1 matrix where n is the input length).

Questions about reshape have been answered in the past, this for example should answer what reshape(-1,1) fully means: What does -1 mean in numpy reshape? (also some of the other below answers explain this very well too)

More Related Contents:

  1. SKLearn warning “valid feature names” in version 1.0
  2. Saving StandardScaler() model for use on new datasets
  3. How to Convert python list into nested dictionaries in pythonic way [closed]
  4. ElementNotVisibleException: Message: element not interactable error while trying to click a button through Selenium and Python
  5. How to add attention layer to a Bi-LSTM
  6. Cannot install NumPy from a wheel format
  7. No multiprocessing print outputs (Spyder)
  8. Wait page to load before getting data with requests.get in python 3
  9. How to use Tor with Chrome browser through Selenium
  10. Python error message io.UnsupportedOperation: not readable
  11. Removing black background and make transparent from grabcut output in python open cv
  12. urllib.error.URLError:
  13. ‘python3’ is not recognized as an internal or external command, operable program or batch file
  14. How to install Anaconda on RaspBerry Pi 3 Model B
  15. ModuleNotFoundError: No module named ‘__main__.xxxx’; ‘__main__’ is not a package
  16. `new_root.mainloop()` doesn’t make main window unresponsive
  17. How do I remove/delete a virtualenv?
  18. in VS Code ImportError: cannot import name ‘Mapping’ from ‘collections’
  19. converting a pandas date to week number
  20. ImportError: libcublas.so.9.0: cannot open shared object file
  21. Python 3.7 Local Development Server Options for new app engine apps
  22. How to send real-time sensor data to PC from Raspberry Pi Zero?
  23. Tkinter: How to make a rounded corner text widget?
  24. Discord Music bot VoiceClient’ object has no attribute ‘create_ytdl_player’
  25. pandas multiindex – how to select second level when using columns?
  26. How to suppress console error/warning/info messages when executing selenium python scripts using chrome canary
  27. Fetching multiple urls with aiohttp in python
  28. ImportError: cannot import name ‘escape’ from ‘jinja2’
  29. Airflow s3 connection using UI
  30. Can’t install Matplotlib on Python 3.10 after its release (2021-10-05)

Leave a Comment