Delete init_frames (only motion is needed here actually)

[todo]

Trainer/trainer/train.py

Lines 72 to 77 in 6de95e1

	# TODO: Delete init_frames (only motion is needed here actually)
	def train_chunk(scene: Scene, motion: flom.Motion, init_frames: Sequence[flom.Frame], robot: Robot, start: float, init_state: StateWithJoints, *, algorithm: str = 'OnePlusOne', num_iteration: int = 1000, weight_factor: float = 0.01, stddev: float = 1, andom_rate: float = 0.2, **kwargs):
	chunk_length = len(init_frames)
	num_joints = len(init_frames[0].positions)
	weight_shape = (chunk_length, num_joints)

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This issue was generated by todo based on a TODO comment in 6de95e1 when #31 was merged. cc @MonoMotion.