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Limit seq_length to max_tokens in timestep_samplers #230

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Limit seq_length to max_tokens in timestep_samplers #230

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4 changes: 4 additions & 0 deletions packages/ltx-trainer/src/ltx_trainer/timestep_samplers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,10 @@ def _get_shift_for_sequence_length(
min_shift: float = 0.95,
max_shift: float = 2.05,
) -> float:
# Without this cap, very large seq_length drives mu up, both percentile bounds
# saturate near 1.0, and zero_terminal_raw divides by ~0 → NaN.
if seq_length > max_tokens:
seq_length = max_tokens
# Calculate the shift value for a given sequence length using linear interpolation
# between min_shift and max_shift based on sequence length.
m = (max_shift - min_shift) / (max_tokens - min_tokens) # Calculate slope
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