def _create_cells(self, cellclass, cellparams, n):
"""
Create cells in NEURON.
`cellclass` -- a PyNN standard cell or a native NEURON cell class that
implements an as-yet-undescribed interface.
`cellparams` -- a dictionary of cell parameters.
`n` -- the number of cells to create
"""
# this method should never be called more than once
# perhaps should check for that
assert n > 0, 'n must be a positive integer'
celltype = cellclass(cellparams)
cell_model = celltype.model
cell_parameters = celltype.parameters
self.first_id = simulator.state.gid_counter
self.last_id = simulator.state.gid_counter + n - 1
self.all_cells = numpy.array(
[id for id in range(self.first_id, self.last_id + 1)],
simulator.ID)
# mask_local is used to extract those elements from arrays that apply to the cells on the current node
self._mask_local = self.all_cells % simulator.state.num_processes == simulator.state.mpi_rank # round-robin distribution of cells between nodes
for i, (id,
is_local) in enumerate(zip(self.all_cells, self._mask_local)):
self.all_cells[i] = simulator.ID(id)
self.all_cells[i].parent = self
if is_local:
self.all_cells[i]._build_cell(cell_model, cell_parameters)
simulator.initializer.register(*self.all_cells[self._mask_local])
simulator.state.gid_counter += n
def setUp(self):
self.id = simulator.ID(984329856)
self.id.parent = MockPopulation()
self.id._cell = MockCell()