How to use the landlab.components.LinearDiffuser function in landlab

def test_bad_director_instance():
    mg = RasterModelGrid((5, 5), xy_spacing=(1, 1))
    mg.add_field("topographic__elevation", mg.node_x + mg.node_y, at="node")
    ld = LinearDiffuser(mg, linear_diffusivity=1.0)
    with pytest.raises(ValueError):
        LossyFlowAccumulator(mg, flow_director=ld)

def test_depression_finder_bad_instance():
    mg = RasterModelGrid((5, 5), xy_spacing=(1, 1))
    mg.add_field("topographic__elevation", mg.node_x + mg.node_y, at="node")
    ld = LinearDiffuser(mg, linear_diffusivity=1.0)
    with pytest.raises(ValueError):
        FlowAccumulator(mg, flow_director="D8", depression_finder=ld)

self.tlam = self.trans * self.grid._dx  # assumes raster

        # Run flow routing and lake filler
        self.flow_accumulator.run_one_step()

        # Instantiate a FastscapeEroder component
        self.eroder = FastscapeEroder(
            self.grid,
            K_sp=self.K,
            m_sp=self.m,
            n_sp=self.m,
            discharge_name="surface_water__discharge",
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=regolith_transport_parameter
        )

"node", "water_erosion_rule__threshold"
        )
        self.threshold[:] = self.threshold_value

        # Instantiate a FastscapeEroder component
        self.eroder = StreamPowerSmoothThresholdEroder(
            self.grid,
            m_sp=self.m,
            n_sp=self.n,
            K_sp=self.K,
            use_Q="surface_water__discharge",
            threshold_sp=self.threshold,
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=regolith_transport_parameter
        )

phi=sediment_porosity,
            v_s=settling_velocity,
            m_sp=self.m,
            n_sp=self.n,
            sp_crit="water_erosion_rule__threshold",
            discharge_field="surface_water__discharge",
            solver=solver,
        )

        # Get the parameter for rate of threshold increase with erosion depth
        self.thresh_change_per_depth = (
            water_erosion_rule__thresh_depth_derivative
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=regolith_transport_parameter
        )

# Instantiate an ErosionDeposition ("hybrid") component
        self.eroder = ErosionDeposition(
            self.grid,
            K="substrate__erodibility",
            F_f=fraction_fines,
            phi=sediment_porosity,
            v_s=settling_velocity,
            m_sp=self.m,
            n_sp=self.n,
            discharge_field="surface_water__discharge",
            solver=solver,
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=self.regolith_transport_parameter
        )

self.grid,
            K=self.K,
            phi=self.params["phi"],
            F_f=self.params["F_f"],
            v_s=v_sc,
            m_sp=self.params["m_sp"],
            n_sp=self.params["n_sp"],
            sp_crit=sp_crit,
            method="threshold_stream_power",
            discharge_method="drainage_area",
            area_field="drainage_area",
            solver=solver,
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=regolith_transport_parameter
        )

# Instantiate an ErosionDeposition component
        self.eroder = ErosionDeposition(
            self.grid,
            K=self.K,
            F_f=fraction_fines,
            phi=sediment_porosity,
            v_s=settling_velocity,
            m_sp=self.m,
            n_sp=self.n,
            discharge_field="surface_water__discharge",
            solver=solver,
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=regolith_transport_parameter
        )

self._verify_fields(self._required_fields)

        # Set up rock-till boundary and associated grid fields.
        self._setup_rock_and_till()

        # Instantiate a FastscapeEroder component
        self.eroder = FastscapeEroder(
            self.grid,
            K_sp=self.erody,
            m_sp=self.m,
            n_sp=self.n,
            discharge_name="surface_water__discharge",
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=self.regolith_transport_parameter
        )

if float(self.n) != 1.0:
            raise ValueError("Model only supports n equals 1.")

        # Instantiate a FastscapeEroder component
        self.eroder = StreamPowerSmoothThresholdEroder(
            self.grid,
            K_sp=self.K,
            m_sp=self.m,
            n_sp=self.n,
            threshold_sp=water_erosion_rule__threshold,
            use_Q="surface_water__discharge",
        )

        # Instantiate a LinearDiffuser component
        self.diffuser = LinearDiffuser(
            self.grid, linear_diffusivity=regolith_transport_parameter
        )