tensorflow/models · error · ValueError

build_loss_fn() must be called after build_model().

Error message

build_loss_fn() must be called after build_model().

What it means

Error "build_loss_fn() must be called after build_model()." thrown in tensorflow/models.

Source

Thrown at official/legacy/detection/modeling/retinanet_model.py:92:92

  def build_loss_fn(self):
    if self._keras_model is None:
      raise ValueError('build_loss_fn() must be called after build_model().')

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/legaacy/detection/modeling/retinanet_model.py:92 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tensorflow/models@e006f5f0d5 (2026-08-24). Data as JSON: /api/errors/f76b13ff813d3e83. Report an issue: GitHub.