##### The exercice is validated is all questions of the exercice are validated


The question 1 is validated if the output is similar to what `unstacked_df.head()`returns:

    | Date                |   ('Prediction', 'AAPL') |   ('Prediction', 'AMZN') |   ('Prediction', 'DAI') |   ('Prediction', 'FB') |   ('Prediction', 'GE') |
    |:--------------------|-------------------------:|-------------------------:|------------------------:|-----------------------:|-----------------------:|
    | 2021-01-01 00:00:00 |                 0.382312 |                -0.072392 |               -0.551167 |             -0.0585555 |                1.05955 |
    | 2021-01-04 00:00:00 |                -0.560953 |                 0.503199 |               -0.79517  |             -3.23136   |                1.50271 |
    | 2021-01-05 00:00:00 |                 0.211489 |                 1.84867  |                0.287906 |             -1.81119   |                1.20321 |

##### The question 2 is validated if the answer is: `unstacked.plot(title = 'Stocks 2021')`. The title can be anything else.