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b5309683 - Cosmos Predict2.5 Base: inference pipeline, scheduler & chkpt conversion (#12852)

Cosmos Predict2.5 Base: inference pipeline, scheduler & chkpt conversion (#12852) * cosmos predict2.5 base: convert chkpt & pipeline - New scheduler: scheduling_flow_unipc_multistep.py - Changes to TransformerCosmos for text embeddings via crossattn_proj * scheduler cleanup * simplify inference pipeline * cleanup scheduler + tests * Basic tests for flow unipc * working b2b inference * Rename everything * Tests for pipeline present, but not working (predict2 also not working) * docstring update * wrapper pipelines + make style * remove unnecessary files * UniPCMultistep: support use_karras_sigmas=True and use_flow_sigmas=True * use UniPCMultistepScheduler + fix tests for pipeline * Remove FlowUniPCMultistepScheduler * UniPCMultistepScheduler for use_flow_sigmas=True & use_karras_sigmas=True * num_inference_steps=36 due to bug in scheduler used by predict2.5 * Address comments * make style + make fix-copies * fix tests + remove references to old pipelines * address comments * add revision in from_pretrained call * fix tests