Return an empty branchmodel object.
raw_data:
One row is one datum. Stores coords in some space.
dist_df:
One row is one datum. Stores distances from each branch of the latent 'Y' shape (three columns).
assignments:
length is number of data points. Entries give rows of 'tips' corresponding to the closest branch.
tips:
Matrix with one row per branch (three total). One column per variable (same dimension as 'raw_data').
models:
List with one element per branch (three total). Currently supports only 'principal.curve' objects from the 'princurve' package.
center:
atomic of the same dimension as 'raw_data[1, ]'.
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