chore(customizer): restore DPO and update DPO config

docs/customizer/tutorials/dpo-customization-job.mdx

@@ -0,0 +1,9 @@
+---
+title: "DPO Customization"
+description: ""
+---
+
+<NotebookViewer
+  name="dpo-customization-job"
+  colabUrl="https://colab.research.google.com/github/NVIDIA-NeMo/nemo-platform/blob/main/docs/customizer/tutorials/dpo-customization-job.ipynb"
+/>

docs/fern/components/NotebookViewer.tsx

@@ -6,6 +6,7 @@
 import type { ReactNode } from "react";
 
 import distillationCustomizationJob from "./notebooks/distillation-customization-job";
+import dpoCustomizationJob from "./notebooks/dpo-customization-job";
 import embeddingCustomizationJob from "./notebooks/embedding-customization-job";
 import loraCustomizationJob from "./notebooks/lora-customization-job";
 import optimizeThroughput from "./notebooks/optimize-throughput";
@@ -17,6 +18,7 @@ import toolCalling from "./notebooks/tool-calling";
 // pages look it up by name: `<NotebookViewer name="sft-customization-job" />`.
 const notebooks: Record<string, unknown> = {
   "distillation-customization-job": distillationCustomizationJob,
+  "dpo-customization-job": dpoCustomizationJob,
   "embedding-customization-job": embeddingCustomizationJob,
   "lora-customization-job": loraCustomizationJob,
   "optimize-throughput": optimizeThroughput,

docs/fern/scripts/validate-notebook-viewer.mjs

@@ -28,6 +28,10 @@ const SOURCE_NOTEBOOKS = {
     ROOT,
     "../../customizer/tutorials/distillation-customization-job.ipynb",
   ),
+  "dpo-customization-job": join(
+    ROOT,
+    "../../customizer/tutorials/dpo-customization-job.ipynb",
+  ),
   "embedding-customization-job": join(
     ROOT,
     "../../customizer/tutorials/embedding-customization-job.ipynb",

docs/troubleshooting/customizer.mdx

@@ -14,6 +14,7 @@ description: ""
 - The platform's shared persistent volume is likely full. Budget against the downloaded base checkpoint size: approximately 3× for Full SFT and 1.5× for LoRA. For example, a 70B BF16 checkpoint is approximately 140 GB, so a Full SFT job can require approximately 420 GB of free disk at peak.
 - These peak estimates include the base checkpoint and job artifacts; the final Full SFT output itself is one full checkpoint. If you also retain a deployment copy, include it separately in capacity planning.
 - Clean up completed job artifacts or increase the PVC size (default: 200Gi at `/var/run/scratch/job`).
+- DPO/GRPO jobs also consume ephemeral node storage under `/tmp` via Ray workers — check node disk in addition to the PVC.
 - See [ft-tut-understand-models](/documentation/customizer-reference/tutorials/understanding-models-and-training) for full storage requirement details.
 
 **Job fails with OOM (Out of Memory):**

plugins/nemo-customizer/README.md

@@ -1,6 +1,6 @@
 # nemo-customizer
 
-Router service for `/apis/customization`. Training backends (Automodel, Unsloth, …) register as **`nemo.customization.contributors`** entry points (discovered via `nemo_platform_plugin.discovery`).
+Router service for `/apis/customization`. Training backends (Automodel, RL, Megatron, …) register as **`nemo.customization.contributors`** entry points (discovered via `nemo_platform_plugin.discovery`).
 
 Registers **`nemo.sdk`** → `customization` for `client.customization.*` (composes contributor SDK modules such as `client.customization.automodel.jobs`).