diff --git a/movielens/ML100K/dvc.lock b/movielens/ML100K/dvc.lock
index 8a70b92..d6e0fed 100644
--- a/movielens/ML100K/dvc.lock
+++ b/movielens/ML100K/dvc.lock
@@ -1241,3 +1241,73 @@ stages:
       md5: ffe7b5a0cc36cf794084c27b51ee3d5e.dir
       size: 34466
       nfiles: 5
+  export-random-grid-Bias:
+    cmd: lenskit-codex sweep export -o sweeps/random/Bias-grid.json sweeps/random/Bias-grid
+      RMSE
+    deps:
+    - path: sweeps/random/Bias-grid
+      hash: md5
+      md5: 334610cb57069f335f3a84ac359de0bb.dir
+      size: 151823
+      nfiles: 6
+    outs:
+    - path: sweeps/random/Bias-grid.json
+      hash: md5
+      md5: fb3659fda3d936b80099e1fa69e925d1
+      size: 283
+  export-random-grid-BiasedMF-ALS:
+    cmd: lenskit-codex sweep export -o sweeps/random/BiasedMF-ALS-grid.json sweeps/random/BiasedMF-ALS-grid
+      RMSE
+    deps:
+    - path: sweeps/random/BiasedMF-ALS-grid
+      hash: md5
+      md5: c804063967d3ecf8492f004d8b1b12b2.dir
+      size: 279963
+      nfiles: 6
+    outs:
+    - path: sweeps/random/BiasedMF-ALS-grid.json
+      hash: md5
+      md5: f59b041122584934ac600b197dbb345c
+      size: 298
+  export-random-grid-IKNN-Explicit:
+    cmd: lenskit-codex sweep export -o sweeps/random/IKNN-Explicit-grid.json sweeps/random/IKNN-Explicit-grid
+      RMSE
+    deps:
+    - path: sweeps/random/IKNN-Explicit-grid
+      hash: md5
+      md5: 9db9ba367886b697f874ca4e94d0aab8.dir
+      size: 97092
+      nfiles: 6
+    outs:
+    - path: sweeps/random/IKNN-Explicit-grid.json
+      hash: md5
+      md5: 3f90fc36f8222a49cf1a5a5f90717607
+      size: 326
+  export-random-grid-IKNN-Implicit:
+    cmd: lenskit-codex sweep export -o sweeps/random/IKNN-Implicit-grid.json sweeps/random/IKNN-Implicit-grid
+      RBP
+    deps:
+    - path: sweeps/random/IKNN-Implicit-grid
+      hash: md5
+      md5: e617ed6aeaf6b2102a2cc1ab1d1b5301.dir
+      size: 66901
+      nfiles: 5
+    outs:
+    - path: sweeps/random/IKNN-Implicit-grid.json
+      hash: md5
+      md5: bd7f1d549c83af129d29b5c4ac8b2425
+      size: 254
+  export-random-grid-ImplicitMF-ALS:
+    cmd: lenskit-codex sweep export -o sweeps/random/ImplicitMF-ALS-grid.json sweeps/random/ImplicitMF-ALS-grid
+      RBP
+    deps:
+    - path: sweeps/random/ImplicitMF-ALS-grid
+      hash: md5
+      md5: 6e46a9e0b4f1b4a327948355c6a801b6.dir
+      size: 231148
+      nfiles: 5
+    outs:
+    - path: sweeps/random/ImplicitMF-ALS-grid.json
+      hash: md5
+      md5: 88d43b130c3b066ed5dbe120a61c7d81
+      size: 232
diff --git a/movielens/ML10M/dvc.lock b/movielens/ML10M/dvc.lock
index 7527f64..14688f3 100644
--- a/movielens/ML10M/dvc.lock
+++ b/movielens/ML10M/dvc.lock
@@ -963,7 +963,7 @@ stages:
       md5: 172f753a6998217f898a2a39115c34a3
       size: 279
   run-temporal-grid-best-Bias:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias.json --test-part=test
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias-grid.json --test-part=test
       --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/Bias
       Bias
     deps:
@@ -1089,8 +1089,8 @@ stages:
       md5: c416f6ea9db07d9312d8501addf24553
       size: 272
   run-temporal-grid-best-BiasedMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS.json --test-part=test
-      --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS-grid.json
+      --test-part=test --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
       BiasedMF-ALS
     deps:
     - path: ../../models/BiasedMF-ALS.toml
@@ -1242,8 +1242,8 @@ stages:
       md5: 434f4101b1118f893cea811093a76287
       size: 219
   run-temporal-grid-best-ImplicitMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS.json --test-part=test
-      --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS-grid.json
+      --test-part=test --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
       ImplicitMF-ALS
     deps:
     - path: ../../models/ImplicitMF-ALS.toml
@@ -1374,8 +1374,8 @@ stages:
       md5: 62bc737ca5067102464b22aea2509c7a
       size: 300
   run-temporal-grid-best-IKNN-Explicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit.json --test-part=test
-      --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit-grid.json
+      --test-part=test --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
       IKNN-Explicit
     deps:
     - path: ../../models/IKNN-Explicit.toml
@@ -1535,8 +1535,8 @@ stages:
       size: 4055243
       nfiles: 19
   run-temporal-grid-best-IKNN-Implicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit.json --test-part=test
-      --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit-grid.json
+      --test-part=test --ds-name=ML10M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
       IKNN-Implicit
     deps:
     - path: ../../models/IKNN-Implicit.toml
diff --git a/movielens/ML20M/dvc.lock b/movielens/ML20M/dvc.lock
index c72fc75..d028c0b 100644
--- a/movielens/ML20M/dvc.lock
+++ b/movielens/ML20M/dvc.lock
@@ -851,8 +851,8 @@ stages:
       md5: 4ce942b2f753913af1ea04ba518687eb
       size: 219
   run-temporal-grid-best-ImplicitMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS.json --test-part=test
-      --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS-grid.json
+      --test-part=test --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
       ImplicitMF-ALS
     deps:
     - path: ../../models/ImplicitMF-ALS.toml
@@ -1000,8 +1000,8 @@ stages:
       md5: 26827eef832a76181867f64da779bebc
       size: 299
   run-temporal-grid-best-BiasedMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS.json --test-part=test
-      --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS-grid.json
+      --test-part=test --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
       BiasedMF-ALS
     deps:
     - path: ../../models/BiasedMF-ALS.toml
@@ -1088,7 +1088,7 @@ stages:
       md5: ae104a019cf7613ebe0ba115298c7a17
       size: 281
   run-temporal-grid-best-Bias:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias.json --test-part=test
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias-grid.json --test-part=test
       --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/Bias
       Bias
     deps:
@@ -1398,8 +1398,8 @@ stages:
       size: 6579618
       nfiles: 19
   run-temporal-grid-best-IKNN-Explicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit.json --test-part=test
-      --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit-grid.json
+      --test-part=test --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
       IKNN-Explicit
     deps:
     - path: ../../models/IKNN-Explicit.toml
@@ -1425,8 +1425,8 @@ stages:
       size: 457567
       nfiles: 3
   run-temporal-grid-best-IKNN-Implicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit.json --test-part=test
-      --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit-grid.json
+      --test-part=test --ds-name=ML20M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
       IKNN-Implicit
     deps:
     - path: ../../models/IKNN-Implicit.toml
diff --git a/movielens/ML25M/dvc.lock b/movielens/ML25M/dvc.lock
index d56a6b9..bd9b841 100644
--- a/movielens/ML25M/dvc.lock
+++ b/movielens/ML25M/dvc.lock
@@ -624,8 +624,8 @@ stages:
       md5: 40121e1601e83b8ec78561035a166550
       size: 217
   run-temporal-grid-best-ImplicitMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS.json --test-part=test
-      --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS-grid.json
+      --test-part=test --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
       ImplicitMF-ALS
     deps:
     - path: ../../models/ImplicitMF-ALS.toml
@@ -690,8 +690,8 @@ stages:
       md5: a5d943a2b2a58844a9d4b991347ab963
       size: 276
   run-temporal-grid-best-BiasedMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS.json --test-part=test
-      --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS-grid.json
+      --test-part=test --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
       BiasedMF-ALS
     deps:
     - path: ../../models/BiasedMF-ALS.toml
@@ -843,8 +843,8 @@ stages:
       md5: 1c394aee581bcdc1de441d7ea48de29c
       size: 245
   run-temporal-grid-best-IKNN-Implicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit.json --test-part=test
-      --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit-grid.json
+      --test-part=test --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
       IKNN-Implicit
     deps:
     - path: ../../models/IKNN-Implicit.toml
@@ -1018,8 +1018,8 @@ stages:
       size: 248713
       nfiles: 3
   run-temporal-grid-best-IKNN-Explicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit.json --test-part=test
-      --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit-grid.json
+      --test-part=test --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
       IKNN-Explicit
     deps:
     - path: ../../models/IKNN-Explicit.toml
@@ -1150,7 +1150,7 @@ stages:
       md5: 7bb56b42411bf743c850619a206afe94
       size: 286
   run-temporal-grid-best-Bias:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias.json --test-part=test
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias-grid.json --test-part=test
       --ds-name=ML25M --split=splits/temporal.toml -o runs/temporal-grid-best/Bias
       Bias
     deps:
diff --git a/movielens/ML32M/dvc.lock b/movielens/ML32M/dvc.lock
index 427bb05..98c869a 100644
--- a/movielens/ML32M/dvc.lock
+++ b/movielens/ML32M/dvc.lock
@@ -251,8 +251,8 @@ stages:
       md5: 43e072b9b0caf38772107e052e555a3c
       size: 216
   run-temporal-grid-best-ImplicitMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS.json --test-part=test
-      --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/ImplicitMF-ALS-grid.json
+      --test-part=test --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/ImplicitMF-ALS
       ImplicitMF-ALS
     deps:
     - path: ../../models/ImplicitMF-ALS.toml
@@ -534,8 +534,8 @@ stages:
       size: 10221078
       nfiles: 19
   run-temporal-grid-best-IKNN-Explicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit.json --test-part=test
-      --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Explicit-grid.json
+      --test-part=test --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Explicit
       IKNN-Explicit
     deps:
     - path: ../../models/IKNN-Explicit.toml
@@ -600,8 +600,8 @@ stages:
       md5: 4390a591c45274a95a64f8fc61c70b0d
       size: 271
   run-temporal-grid-best-BiasedMF-ALS:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS.json --test-part=test
-      --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/BiasedMF-ALS-grid.json
+      --test-part=test --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/BiasedMF-ALS
       BiasedMF-ALS
     deps:
     - path: ../../models/BiasedMF-ALS.toml
@@ -671,8 +671,8 @@ stages:
       size: 638898
       nfiles: 3
   run-temporal-grid-best-IKNN-Implicit:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit.json --test-part=test
-      --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/IKNN-Implicit-grid.json
+      --test-part=test --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/IKNN-Implicit
       IKNN-Implicit
     deps:
     - path: ../../models/IKNN-Implicit.toml
@@ -756,7 +756,7 @@ stages:
       md5: d8deef2ad6bfed40eee1f6202d1d809f
       size: 282
   run-temporal-grid-best-Bias:
-    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias.json --test-part=test
+    cmd: lenskit-codex generate --param-file=sweeps/temporal/Bias-grid.json --test-part=test
       --ds-name=ML32M --split=splits/temporal.toml -o runs/temporal-grid-best/Bias
       Bias
     deps: