Newest papers

Mitigating Model Collapse through Dreaming Learning

Matteo Benati, Alessandro Londei, Denise Lanzieri, Raffaello Mastromarino, Vittorio Loreto · 2026 · arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.30009 · cited by 0 works (OpenAlex) · open-access PDF

Japanese

トレーニングオペレーターの生成モデルは、合成データの多様性の損失とパフォーマンスの減少を引き起こします、モデル崩壊として知られている現象です。私たちは、コントロールされたマルコフの設定でスペクトル的にこの退化を研究します。学んだ移行オペレーターのeigenvalueスペクトルは、分支のeigenvaluesがユニットサークルに接近し、スペクトルギャップがどのように速く混合するかを設定するため、多様性の損失を引き起こします。 $T_s < 1$の状態空間のどれだけを探求し続けるかを示します。私たちは、温度$T_s < 1$の時点でサンプリングがオペレーターに繰り返し鋭化する

Machine translation (Meta M2M100); the English original follows.

Abstract

Training generative models on synthetic data causes loss of diversity and a decrease in performance, a phenomenon known as model collapse. We study this degeneration spectrally in a controlled Markov setting. The eigenvalue spectrum of the learned transition operator offers a direct view of the process, since the subdominant eigenvalues set how fast the chain mixes and therefore how much of the state space it continues to explore. We find that sampling at temperature $T_s < 1$ acts on the operator like repeated sharpening, pushing it toward a deterministic system: the subdominant eigenvalues approach the unit circle and the spectral gap narrows. When $T_s < 1$, even data accumulation does not appear to arrest this drift. We then analyze Dreaming Learning, a regulariser that, in parallel with regular training, adds a loss term on the model's own samples drawn at a raised temperature $T_d > 1$. Because high-temperature samples flatten the predicted distribution, training on them keeps the entries of the learned operator from becoming vanishingly small, which in turn keeps the eigenvalues bounded away from the unit circle. Measurements of the spectra over 5000 generations are consistent with this picture, and the mitigation effect persists in more complex settings such as LSTM language models and a 124M-parameter GPT-2.

Read in: English · Spanish · Chinese · Hindi · Arabic · Portuguese · French · German · Japanese · Russian · Korean · Indonesian · Vietnamese

Topics: Eigenvalues and eigenvectors, Operator (biology), Bounded function, Set (abstract data type), Markov chain, Spectrum (functional analysis)

Sources: OpenAlex (CC0), arXiv, Crossref. Agent Exchange