Update get_started section in README

CHANGELOG.md

@@ -37,7 +37,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - 
 - Rename `_SARIMAXModel` and `_ProphetModel`, make `SARIMAXModel` and `ProphetModel` inherit from `PerSegmentPredictionIntervalModel` ([#549](https://github.com/tinkoff-ai/etna/pull/549))
 - 
-- 
+- Update get_started section in README ([#569](https://github.com/tinkoff-ai/etna/pull/569))
 - 
 - Make `LabelEncoderTransform` and `OneHotEncoderTransform` multi-segment ([#554](https://github.com/tinkoff-ai/etna/pull/554))
 ### Fixed

README.md

@@ -81,13 +81,23 @@ ETNA supports configuration files. It means that library will check that all the
 
 To set up a configuration for your project you should create a `.etna` file at the project's root. To see the available options look at [`Settings`](https://github.com/tinkoff-ai/etna/blob/master/etna/settings.py#L68). There is an [example](https://github.com/tinkoff-ai/etna/tree/master/examples/configs/.etna) of configuration file. 
 
-## Get started 
+## Get started
+
 Here's some example code for a quick start.
 ```python
 import pandas as pd
+
 from etna.datasets.tsdataset import TSDataset
-from etna.models import ProphetModel
+from etna.metrics import SMAPE
+from etna.models import CatBoostModelMultiSegment
 from etna.pipeline import Pipeline
+from etna.transforms import DateFlagsTransform
+from etna.transforms import DensityOutliersTransform
+from etna.transforms import FourierTransform
+from etna.transforms import LagTransform
+from etna.transforms import LinearTrendTransform
+from etna.transforms import SegmentEncoderTransform
+from etna.transforms import TimeSeriesImputerTransform
 
 # Read the data
 df = pd.read_csv("examples/data/example_dataset.csv")
@@ -99,15 +109,40 @@ ts = TSDataset(df, freq="D")
 # Choose a horizon
 HORIZON = 8
 
+# Make train_test_split
+train_ts, test_ts = ts.train_test_split(test_size=HORIZON)
+
+# prepare transforms
+transforms = [
+    DensityOutliersTransform(in_column="target", distance_coef=1.0),
+    TimeSeriesImputerTransform(in_column="target", strategy="forward_fill"),
+    LinearTrendTransform(in_column="target"),
+    LagTransform(in_column="target", lags=list(range(HORIZON, 21)), out_column="target_lag"),
+    DateFlagsTransform(
+        day_number_in_week=True,
+        day_number_in_month=True,
+        is_weekend=True,
+        week_number_in_month=True,
+        out_column="date_flag",
+    ),
+    FourierTransform(period=360.25, order=20, out_column="fourier"),
+    SegmentEncoderTransform(),
+]
+
 # Fit the pipeline
-pipeline = Pipeline(model=ProphetModel(), horizon=HORIZON)
-pipeline.fit(ts)
+pipeline = Pipeline(model=CatBoostModelMultiSegment(), transforms=transforms, horizon=HORIZON)
+pipeline.fit(train_ts)
 
 # Make the forecast
 forecast_ts = pipeline.forecast()
+
+metric = SMAPE(mode="macro")
+metric_value = metric(y_true=test_ts, y_pred=forecast_ts)
+print(f"SMAPE = {metric_value:.3f}")
 ```
 
 ## Tutorials
+
 We have also prepared a set of tutorials for an easy introduction:
 
 | Notebook     | Interactive launch  |
@@ -121,6 +156,7 @@ We have also prepared a set of tutorials for an easy introduction:
 | [Ensembles](https://github.com/tinkoff-ai/etna/tree/master/examples/ensembles.ipynb) | [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/tinkoff-ai/etna/master?filepath=examples/ensembles.ipynb) |
 
 ## Documentation
+
 ETNA documentation is available [here](https://etna-docs.netlify.app/).
 
 ## Resources
@@ -134,6 +170,7 @@ ETNA documentation is available [here](https://etna-docs.netlify.app/).
 ## Acknowledgments
 
 ### ETNA.Team
+
 [Andrey Alekseev](https://github.com/iKintosh),
 [Nikita Barinov](https://github.com/diadorer),
 [Dmitriy Bunin](https://github.com/Mr-Geekman),
@@ -148,6 +185,7 @@ ETNA documentation is available [here](https://etna-docs.netlify.app/).
 [Julia Shenshina](https://github.com/julia-shenshina)
 
 ### ETNA.Contributors
+
 [Artem Levashov](https://github.com/soft1q),
 [Aleksey Podkidyshev](https://github.com/alekseyen),
 [Carlosbogo](https://github.com/Carlosbogo)