How to convert a Python list of lists to a 2D numpy array for sklearn.preprocessing
I currently have a list which contains all of my input for an sklearn classifier. Each element in that list is a list of features, where each element represents a song in my dataset. I need to convert this structure to a 2D numpy array so I can scale my data via sklearn's preprocessing. This is proving to be very difficult. y =  all_feats =  for song in data: mfccs_in_song = song oned_mfccs_in_song =  for frame in mfccs_in_song: for m in frame: oned_mfccs_in_song.append(m) all_feats.append(oned_mfccs_in_song) label = song[-1] y.append(label) Long story short, all_feats is that list of lists. It has a length of 600. How can I convert this to a numpy array for preprocessing? I have tried numerous things, including simply all_feats = np.array(all_feats), however that does not work.
That error suggests that all_feats may not have sublists of the same size. Take a look at its contents, and once you figure out what's the right length for the sublists, and how to prune the extra elements out, you can run all_feats = np.array(all_feats) and it should work! Take a look at the answers in this link for more explanation.
There is a duplicate line showed when calling a __init__ in Python script
trouble with mousewheel + scrollbars in tkinter
Python Cutting a string on a certain point
Ansible become_user error UnicodeEncodeError: 'ascii' codec can't encode character
Dynamic way to create new columns as a function of existing columns in pandas
polymorphic dispatch: distinguishing Python integers vs. floating-point numbers vs. strings
HTCondor output files: obtain created directory
getting select values with flask [duplicate]
Tensorflow tf.matmul example is incorrect?
drawing flower with python turtle
Python while loop iteration does not work
Rows not displaying properly in Tkinter GUI
Getting InvalidArgumentError in Tensorflow
Django - 2 URLS with same regex, but different variables and views
Parse headers with urllib2 if there is a duplicate [duplicate]
Python histogram outline