Update trainer.py

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Rename sd15_flowmatch_david_hf_3_epochunknown_step18750.safetensors to sd15_flowmatch_david_comfyui_e3.safetensors

Delete sd15_flowmatch_david_comfyui_e3.safetensors.safetensors

Upload checkpoint: epoch unknown, step 18750

Rename sd15_flowmatch_david_hf_3_epochunknown_step18750.safetensors to sd15_flowmatch_david_comfyui_e3.safetensors.safetensors

Upload checkpoint: epoch unknown, step 18750

Rename sd15_flowmatch_david_hf_2_comfyui.safetensors to sd15_flowmatch_david_comfyui_e2.safetensors

Rename sd15_flowmatch_david_hf_2_epochunknown_step12500.safetensors to sd15_flowmatch_david_hf_2_comfyui.safetensors

Upload checkpoint: epoch unknown, step 12500

Rename sd15_flowmatch_david_hf_1.safetensors to sd15_flowmatch_david_diffusers_e1.safetensors

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Upload checkpoint: epoch unknown, step 6250

Create trainer.py

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