remove adjoint grad_eps monitors

CHANGELOG.md

@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Removed validator from `CustomFieldSource` that ensured data spanned the source geometry. Now the current values are extrapolated outside of the supplied data ranges.
 - `CustomMedium` now take fields `permittivity` and `conductivity`. `eps_dataset` will be deprecated in v3.0.
 - Moved `CustomMedium._interp` to `Coords.spatial_interp` to be used by custom current sources.
+- Adjoint simulations no longer contain unused gradient permittivity monitors, reducing processing time.
 
 ### Fixed
 - Plotting 2D materials in `SimulationData.plot_field` and other circumstances.

tidy3d/plugins/adjoint/components/data/sim_data.py

@@ -175,6 +175,7 @@ def make_adjoint_simulation(self, fwidth: float) -> JaxSimulation:
             self.simulation.get_grad_monitors(
                 input_structures=self.simulation.input_structures,
                 freq_adjoint=self.simulation.freq_adjoint,
+                include_eps_mnts=False,
             )
         )
         return self.simulation.updated_copy(**update_dict)

tidy3d/plugins/adjoint/components/simulation.py

@@ -425,7 +425,9 @@ def to_simulation_fwd(self) -> Tuple[Simulation, JaxInfo, JaxInfo]:
         return sim_fwd, jax_info_fwd, jax_info
 
     @staticmethod
-    def get_grad_monitors(input_structures: List[Structure], freq_adjoint: float) -> dict:
+    def get_grad_monitors(
+        input_structures: List[Structure], freq_adjoint: float, include_eps_mnts: bool = True
+    ) -> dict:
         """Return dictionary of gradient monitors for simulation."""
         grad_mnts = []
         grad_eps_mnts = []
@@ -434,7 +436,8 @@ def get_grad_monitors(input_structures: List[Structure], freq_adjoint: float) ->
                 freq=freq_adjoint, name=f"grad_mnt_{index}"
             )
             grad_mnts.append(grad_mnt)
-            grad_eps_mnts.append(grad_eps_mnt)
+            if include_eps_mnts:
+                grad_eps_mnts.append(grad_eps_mnt)
         return dict(grad_monitors=grad_mnts, grad_eps_monitors=grad_eps_mnts)
 
     def store_vjp(