feat: extend include_meta to MockStream

Signed-off-by: nstarman <[email protected]>

src/galax/dynamics/_dynamics/mockstream/mockstream_generator.py

@@ -10,6 +10,7 @@
 import jax
 import jax.numpy as jnp
 import quax.examples.prng as jr
+from jax.lax import stop_gradient
 from jax.lib.xla_bridge import get_backend
 
 import quaxed.array_api as xp
@@ -144,7 +145,7 @@ def one_pt_intg(
         lead_arm_w, trail_arm_w = jax.vmap(one_pt_intg)(pt_ids, w0_lead, w0_trail)
         return lead_arm_w, trail_arm_w
 
-    @partial(jax.jit, static_argnames=("vmapped",))
+    @partial(jax.jit, static_argnames=("vmapped", "include_meta"))
     def run(
         self,
         rng: jr.PRNG,
@@ -153,6 +154,7 @@ def run(
         prog_mass: gt.FloatQScalar | ProgenitorMassCallable,
         *,
         vmapped: bool | None = None,
+        include_meta: bool = False,
     ) -> tuple[MockStream, PhaseSpacePosition]:
         """Generate mock stellar stream.
 
@@ -174,6 +176,9 @@ def run(
             `None` (default), then `jax.vmap` is used on GPU and `jax.lax.scan`
             otherwise.
 
+        include_meta : bool, optional keyword-only
+            Whether to include metadata in the output.
+
         Returns
         -------
         mockstream : :class:`galax.dynamcis.MockStream`
@@ -241,16 +246,20 @@ def run(
             raise ValueError(msg)
 
         mockstream = MockStream(
-            q=Quantity(q, self.units["length"]),
+            q=Quantity(q, self.units["length"]),  # TODO: already Q?
             p=Quantity(p, self.units["speed"]),
             t=t,
             release_time=release_time,
-            meta={
-                "generator": self,
-                "rng": original_rng,
-                "mass": prog_mass,
-                "vmapped": use_vmap,
-            },
+            meta=(
+                {
+                    "generator": stop_gradient(self),
+                    "rng": stop_gradient(original_rng),
+                    "mass": stop_gradient(prog_mass),
+                    "vmapped": use_vmap,
+                }
+                if include_meta
+                else {}
+            ),
         )
 
         return mockstream, prog_o[-1]