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# daal4py outlier detection multivariate example for shared memory systems

import daal4py as d4p
import numpy as np

# let's try to use pandas' fast csv reader
try:
    import pandas
    read_csv = lambda f, c, t=np.float64: pandas.read_csv(f, usecols=c, delimiter=',', header=None, dtype=t)
except:
    # fall back to numpy loadtxt
    read_csv = lambda f, c, t=np.float64: np.loadtxt(f, usecols=c, delimiter=',', ndmin=2)


def main(readcsv=read_csv, method='defaultDense'):
    # Input file
    infile = "./data/batch/outlierdetection.csv"

    # Retrieve the data from the input file
    data = readcsv(infile, range(3))

    # Create an algorithm to detect outliers using the default method
    algorithm = d4p.multivariate_outlier_detection()

    # Compute outliers and get the computed results
    res = algorithm.compute(data, None, None, None)

    # result provides weights
    assert res.weights.shape == (data.shape[0], 1)

    return (data, res)


if __name__ == "__main__":
    (data, res) = main()

    print("\nInput data\n", data)
    print("\nOutlier detection result (Default method) weights:\n", res.weights)
    print('All looks good!')
