SOM init with a previous codebook

sompy.py

class SOM(object):
	def __init__(self,
			data,
			neighborhood,
			prev_codebook_matrix=None, # initialization with previous codebook matrix
			normalizer=None,
			mapsize=None,
			mask=None,
			mapshape='planar',
			lattice='rect',
			initialization='pca',
			training='batch',
			name='sompy',
			component_names=None):
		
		self._data = normalizer.normalize(data) if normalizer else data
		self._normalizer = normalizer
		self._dim = data.shape[1]
		self._dlen = data.shape[0]
		self._dlabel = None
		self._bmu = None

		self.name = name
		self.data_raw = data
		self.neighborhood = neighborhood
		self.mapshape = mapshape
		self.initialization = initialization
		self.mask = mask or np.ones([1, self._dim])
		mapsize = self.calculate_map_size(lattice) if not mapsize else mapsize
		#############################################################################
		# self.codebook = Codebook(mapsize, lattice)
		if prev_codebook_matrix == None:
			self.codebook = Codebook(mapsize, lattice)
		else:
			self.codebook = Codebook(mapsize, lattice)
			self.codebook.matrix = prev_codebook_matrix # initialization with previous codebook matrix
		#############################################################################
		self.training = training
		self._component_names = self.build_component_names() if component_names is None else [component_names]
		self._distance_matrix = self.calculate_map_dist()