Estimate Density Ratio p_nu(x)/p_de(y) by uLSIF (unconstrained Least-Square Importance Fitting)

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`x` |
numeric vector or matrix as data from a numerator distribution p_nu(x). |

`y` |
numeric vector or matrix as data from a denominator distribution p_de(y). |

`sigma` |
positive numeric vector as a search range of Gaussian kernel bandwidth. |

`lambda` |
positive numeric vector as a search range of regularization parameter. |

`kernel_num` |
positive integer as number of kernels. |

`verbose` |
logical(default TRUE). |

uLSIF object that contains the function to estimate density ratio.

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