add fleet_train_infer_python.md (#5383)
* Create fleet_train_infer.md * Create amp_train_infer_python.md * Rename fleet_train_infer.md to fleet_train_infer_python.md * Update fleet_train_infer_python.md * Update fleet_train_infer_python.md * Update fleet_train_infer_python.md * upload fleet train md * Update fleet_train_infer_python.md * Update fleet_train_infer_python.md * rm empty amp.md
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