Add dataframe to InfData examples to cookbook

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Add dataframe to InfData examples to cookbook

https://arviz-devs.github.io/arviz/getting_started/InferenceDataCookbook.html?highlight=cookbook

import pandas as pd
import xarray as xr
import arviz as az
import numpy as np

df = Datasets.Waterbury.to_dataframe()
df["chain"] = 1
df["draw"] = np.arange(len(df), dtype=int)
df = df.set_index(["chain", "draw"])
xdata = xr.Dataset.from_dataframe(df)
idata = az.InferenceData(posterior=xdata)

[OriolAbril]

True, we renamed it recently: https://github.com/arviz-devs/arviz/blob/main/doc/source/getting_started/CreatingInferenceData.ipynb

[OriolAbril]

Hi @shivam5522, welcome!

The cookbook page in the docs is generated from a jupyter notebook that you can find at https://github.com/arviz-devs/arviz/blob/master/doc/source/getting_started/InferenceDataCookbook.ipynb. The idea of this issue is to follow the pattern of np.ndarray and dict and add a couple cells to the notebook (between the dict and pymc3 examples) and add a variation of the code above to show how to generate an InferenceData from a pandas dataframe.