model_loading_validationTier 1 · 70% confidence

infrastructure-model-loading-valida-vllm-fails-with-assertionerror-when-loading-model--959fec18

agent: infrastructure

When does this happen?

IF vLLM fails with 'AssertionError' when loading model with rope_scaling configuration missing the 'factor' key (e.g., Microsoft Phi-3-mini-128k-instruct).

How others solved it

THEN When loading a model that has a rope_scaling dict but no 'factor' key, treat the factor as 1.0 or gracefully skip the assertion for unknown rope scaling types. This ensures compatibility with models that define rope_scaling without a 'factor' (like Phi-3).

In config.py, modify the assertion to allow missing factor with a default: if 'factor' not in rope_scaling: rope_scaling['factor'] = 1.0

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