Make torch an optional import - #37
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torch, torchdiffeq, roma, and opt-einsum are only required for the batched simulator (BatchedMultirotor, simulate_batch, BatchedSE3Control, etc.). Moving them to an optional extra avoids forcing all users to install PyTorch (~2 GB) when they only need the standard single-drone simulator. - pyproject.toml: remove the four packages from core dependencies and add a new `batched` extra; also include them in `all` - Wrap top-level torch/roma/torchdiffeq imports with try/except in every file that mixes batched and non-batched classes, so those modules remain importable without the extra installed Install the batched simulator with: pip install rotorpy[batched] Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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