Add prediction_actual_scatter_plot

[Mr-Geekman]

IMPORTANT: Please do not create a Pull Request without creating an issue first.

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Proposed Changes

Look #590.

Related Issue

#590.

Closing issues

Closes #590.

[Mr-Geekman]

Example script:

import matplotlib.pyplot as plt
import pandas as pd

from etna.analysis import prediction_actual_scatter_plot
from etna.datasets import TSDataset
from etna.metrics import MAE
from etna.models import ProphetModel
from etna.pipeline import Pipeline

HORIZON = 14


def main():
    df = pd.read_csv("examples/data/example_dataset.csv", parse_dates=["timestamp"])
    ts = TSDataset(df=TSDataset.to_dataset(df), freq="D")
    model = ProphetModel()
    pipeline = Pipeline(model=model, horizon=HORIZON)
    metrics = [MAE()]
    metrics_df, forecast_df, fold_info_df = pipeline.backtest(ts=ts, n_folds=3, metrics=metrics)

    prediction_actual_scatter_plot(forecast_df=forecast_df, ts=ts)
    plt.savefig("prediction_vs_actual_scatter_plot")


if __name__ == "__main__":
    main()

prediction_vs_actual_scatter_plot:

[codecov-commenter]

Codecov Report

Merging #610 (a5c90a7) into master (7dd9448) will decrease coverage by 0.39%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master     #610      +/-   ##
==========================================
- Coverage   85.14%   84.75%   -0.40%     
==========================================
  Files         118      118              
  Lines        5884     5916      +32     
==========================================
+ Hits         5010     5014       +4     
- Misses        874      902      +28     

Impacted Files	Coverage Δ
etna/analysis/eda_utils.py	17.31% <9.67%> (-1.61%)	⬇️
etna/analysis/__init__.py	100.00% <100.00%> (ø)

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