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I am asking this model fit( ) function.

fit(x=array_x, y=array_y, batch_size=32, epochs=10)

The question is straightforward:

Whether fit( ) will automatically shuffle the input dataset? (array_x, array_y in this case)

I ask this question because I find my fit( ) and fit_generator( ) has different outputs, with same input. My generator feeds inputs to fit_generator( ) in order. I guess the reason is about shuffle.

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Yes, by default it does shuffle.

Here is the documentation: https://keras.io/models/model/#fit

The call signature, by default is then:

fit(x=None, y=None, batch_size=None, epochs=1, verbose=1, callbacks=None,
    validation_split=0.0, validation_data=None, shuffle=True, 
    lass_weight=None, sample_weight=None, initial_epoch=0,
    steps_per_epoch=None, validation_steps=None, validation_freq=1,
    ax_queue_size=10, workers=1, use_multiprocessing=False)
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