SimPEG.potential_fields.base.BasePFSimulation#

class SimPEG.potential_fields.base.BasePFSimulation(mesh, ind_active=None, store_sensitivities='ram', n_processes=1, sensitivity_dtype=<class 'numpy.float32'>, **kwargs)[source]#

Bases: LinearSimulation

Base class for potential field simulations that use integral formulations.

For integral formulations, the forward simulation for a set of voxel cells can be defined as a linear operation of the form:

\[\mathbf{d} = \mathbf{Am}\]

where \(\mathbf{d}\) are the data, \(\mathbf{m}\) are the model paramters and \(\mathbf{A}\) is a linear operator defining the sensitivities. The primary difference between child simulation classes is the kernel function used to create the rows of \(\mathbf{A}\).

Parameters:

meshdiscretize.TensorMesh or discretize.TreeMesh

A 3D tensor or tree mesh.

ind_activenp.ndarray of int or bool

Indices array denoting the active topography cells.

store_sensitivities{‘ram’, ‘disk’, ‘forward_only’}

Options for storing sensitivities. There are 3 options

‘ram’: sensitivities are stored in the computer’s RAM
‘disk’: sensitivities are written to a directory
‘forward_only’: you intend only do perform a forward simulation and sensitivities do not need to be stored

n_processesNone or int, optional

The number of processes to use in the internal multiprocessing pool for forward modeling. The default value of 1 will not use multiprocessing. Any other setting will. None implies setting by the number of cpus.

Notes

If using multiprocessing by setting n_processes to a value other than 1, you must be aware of the method your operating system uses to spawn the subprocesses. On Windows the default method starts new processes that all import the main script. Therefor you must protect the calls to this class by testing if you are in the main process with:

>>> from SimPEG.potential_fields import gravity
>>> if __name__ == '__main__':
...     # Do your processing here
...     sim = gravity.Simulation3DIntegral(n_processes=4, ...)
...     sim.dpred(m)

This usually does not affect jupyter notebook environments.

Attributes

`G`	The linear operator.
`clean_on_model_update`	A list of solver objects to clean when the model is updated
`counter`	SimPEG `Counter` object to store iterations and run-times.
`deleteTheseOnModelUpdate`	A list of properties stored on this object to delete when the model is updated
`ind_active`	Active topography cells.
`linear_model`	The model for a linear problem physical property model.
`mesh`	Mesh for the simulation.
`model`	The inversion model.
`model_deriv`	Derivative of The model for a linear problem wrt the model.
`model_map`	Mapping of the inversion model to The model for a linear problem.
`needs_model`	True if a model is necessary
`sensitivity_dtype`	dtype of the sensitivity matrix.
`sensitivity_path`	Path to directory where sensitivity file is stored.
`solver`	Numerical solver used in the forward simulation.
`solver_opts`	Solver-specific parameters.
`store_sensitivities`	Options for storing sensitivities.
`survey`	The survey for the simulation.
`verbose`	Verbose progress printout.

n_processes

Methods

`Jtvec`(m, v[, f])	Compute the Jacobian transpose times a vector for the model provided.
`Jtvec_approx`(m, v[, f])	Approximation of the Jacobian transpose times a vector for the model provided.
`Jvec`(m, v[, f])	Compute the Jacobian times a vector for the model provided.
`Jvec_approx`(m, v[, f])	Approximation of the Jacobian times a vector for the model provided.
`dpred`([m, f])	Predicted data for the model provided.
`fields`(m)	Return the computed geophysical fields for the model provided.
`getJ`(m[, f])	Returns the full Jacobian.
`linear_operator`()	Return linear operator.
`make_synthetic_data`(m[, relative_error, ...])	Make synthetic data for the model and Gaussian noise provided.
`residual`(m, dobs[, f])	The data residual.