Model Serving

Hugging Face Transformers endpoint slices return stale data during A/B testing

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Problem Description During a production A/B test that routes traffic to two model variants (v1 and v2) via Hugging Face Inference Endpoints, a subset of requests returns predictions from the previous model version. The symptom manifests as: Inconsistent inference results for identical inputs. Log entries such as ModelVersionMismatchError: Expected version ‘v2’, but serving ‘v1’. Cache‑related warnings: … Read more

ONNX Runtime RAG reranker timeout during inference serving

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Problem – RAG Reranker Timeout During Inference Serving The Retrieval‑Augmented Generation (RAG) pipeline is deployed on a production inference service that uses ONNX Runtime for low‑latency model execution. Under moderate request load the reranker stage fails to finish within the allocated time budget, causing the entire request to time‑out. Typical symptoms observed in logs: Ort::Exception: … Read more

RAG document loader crash during backup restoration

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Problem Description During a disaster‑recovery run, the RAG DocumentLoader used by a Hugging Face Transformers RagSequenceForGeneration pipeline crashes while ingesting documents from a cloud‑based backup. The restoration process aborts, leaving the knowledge base unavailable. Typical error output observed in the logs: Traceback (most recent call last): File “/opt/app/rag_loader.py”, line 112, in load_documents documents = loader.load() … Read more

TensorRT training job completion timeout with mixed precision

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Problem – TensorRT Mixed‑Precision Training Jobs Time Out In a distributed training pipeline that leverages TensorRT engine building with FP16 (or INT8‑fallback) on NVIDIA A100 GPUs, the job aborts before completing the expected number of epochs. Typical symptoms include: Training script exits with TensorRTBuilderError: Engine building timed out after 1800 seconds. CUDA watchdog messages in … Read more

ONNX Runtime index rebuild failure during batch inference

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Problem Description During high‑throughput batch inference the ONNX Runtime throws an exception similar to: Ort::Exception: Failed to rebuild model index: InvalidArgument – Model index is corrupted. or RuntimeError: Unable to rebuild model index after session reset – possible concurrent modification. The failure occurs after the first batch finishes and subsequent batches either produce incorrect results … Read more

Hugging Face Transformers query latency spike after Kubernetes autoscale

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Problem Description During peak traffic (≈10 000 req/min) the Hugging Face Transformers inference service, deployed behind an NGINX Ingress controller on a Kubernetes cluster with Horizontal Pod Autoscaler (HPA) enabled, exhibited a sudden latency increase: Baseline latency: ~50 ms per request. Observed tail latency: 1 s – 2 s, often resulting in client‑side timeouts. NGINX logs showed repeated 504 Gateway Timeout errors: 2024/06/19 12:45:23 … Read more

Hugging Face Transformers SSL/TLS handshake failure in Kubernetes

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Hugging Face Transformers SSL/TLS Handshake Failure in a Canary Deployment on Kubernetes Problem Description During a staged rollout of a model‑inference service that uses Hugging Face Transformers, a subset of pods (the canary) repeatedly fail to load pretrained models from https://huggingface.co. The failure manifests as: Log entry from the Transformers library: urllib3.exceptions.SSLError: HTTPSConnectionPool(host=’huggingface.co’, port=443): Max … Read more

ONNX Runtime RAG retrieval empty results after rolling update

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Problem Description After a rolling update of the ONNX Runtime (ORT) library in a production Retrieval‑Augmented Generation (RAG) service, the retrieval component consistently returns empty result sets. The symptom manifests as: Search logs contain INFO: Retrieval returned 0 results – query embedding norm is 0.0, check model initialization. Embedding generation logs sometimes show WARN: Embedding … Read more

RAG answer extraction fails during canary deployment in vLLM

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Problem: RAG Answer Extraction Fails During Canary Deployment in vLLM During a canary rollout of a new vLLM pod (10 % of traffic) the downstream RAG post‑processor intermittently returns an empty string or raises RAGExtractorError. The symptom is observed as incomplete or incorrect answers returned to the client, while the baseline version continues to work. Typical … Read more

TensorRT container crashes repeatedly on Ubuntu with NVIDIA GPU

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Problem Description During local development on an Ubuntu workstation equipped with an NVIDIA GPU, a TensorRT Docker container repeatedly crashes and Docker restarts it in a loop. Typical log excerpts look like one of the following: Failed to initialize TensorRT runtime: CUDA driver version is insufficient for CUDA runtime version libnvidia-ml.so.1: cannot open shared object … Read more