Computes masses and weights for `epGPCA`

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`DATA` |
original data; will be used to compute masses and weights if none are provided. |

`masses` |
a vector or (diagonal) matrix of masses for the row items. If NULL (default), masses are computed as 1/# of rows |

`weights` |
a vector or (diagonal) matrix of weights for the column items. If NULL (default), weights are computed as 1/# of columns |

Returns a list with the following items:

`M` |
a diagonal matrix of masses (if too large, a vector is returned). |

`W` |
a diagonal matrix of weights (if too large, a vector is returned). |

Derek Beaton

`epGPCA`

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