@m3tobom_M Sir I am following this link. Changed my x_train, y_train type exactly same they both are
type(x_train)
Out[10]: numpy.ndarray

type(y_train)
Out[11]: numpy.ndarray

as in given example.
Now when I m trying its giving error
ValueError: Expected array-like (array or non-string sequence), got 7
The complete traceback is
 model.partial_fit(x_train[indices], y_train[indices], classes=7)

  File "C:\Users\krishna\Anaconda3\lib\site-packages\sklearn\neural_network\_multilayer_perceptron.py", line 1061, in _partial_fit
    if _check_partial_fit_first_call(self, classes):

  File "C:\Users\krishna\Anaconda3\lib\site-packages\sklearn\utils\multiclass.py", line 316, in _check_partial_fit_first_call
    if not np.array_equal(clf.classes_, unique_labels(classes)):

  File "C:\Users\krishna\Anaconda3\lib\site-packages\sklearn\utils\multiclass.py", line 77, in unique_labels
    ys_types = set(type_of_target(x) for x in ys)

  File "C:\Users\krishna\Anaconda3\lib\site-packages\sklearn\utils\multiclass.py", line 77, in <genexpr>
    ys_types = set(type_of_target(x) for x in ys)

  File "C:\Users\krishna\Anaconda3\lib\site-packages\sklearn\utils\multiclass.py", line 243, in type_of_target
raise ValueError('Expected array-like (array or non-string sequence), '

ValueError: Expected array-like (array or non-string sequence), got 7

@ptrblck sir you are my last hope