Echidnas, or spiny anteaters, are the only other mammals that lay eggs. They are a species of primitive mammals called monotremes. Since they only have grinding plates and no teeth, platypuses use any gravel or dirt they scooped up while on the bottom of the waterbed to mash their food into digestible pieces.
When platypuses find something interesting, like shellfish, insects, larvae or worms, they scoop it up in their bills, store it in their cheek pouches and swim to the surface. As they swim, they try to detect food along the muddy bottom of the river, stream, pond or lake using their sensitive bills. They hunt for their food in the water where they live. Platypuses are carnivorous, which means they eat meat but not plants. When not hunting, they stay in their burrows. They are most active during nighttime and dusk, because they are nocturnal. Platypuses usually spend their time hunting for food, and a hunt can last 10 to 12 hours. Their waterproof, thick fur keeps platypuses warm in chilly temperatures, and their big tails store extra fat for energy. They have been found in plateaus, lowlands, tropical rainforests, and the cold mountains of Tasmania and the Australian Alps. Though they exist on only one side of one continent, platypuses weather many climate extremes. Platypuses also live under rock ledges, roots or debris. These burrows are tunnels that have rooms or chambers. While they are in the water a lot, they will also waddle onto the riverbanks to dig burrows with their claws. These creatures make their homes in the freshwater areas that flow throughout the island of Tasmania and the eastern and southeastern coast of Australia. Platypuses live in only one, small area of the world. (Image credit: worldswildlifewonders Shutterstock) Habitat appear to be working.All of the monotremes, or egg-laying mammals such as the platypus and echidna, lost their stomachs during the course of evolution. While the algorithms NSGAIII, NSGAII, SPEA2, etc.
I get other types of error messages with other algorithms (OMOPSO, GDE3). TypeError: 'float' object has no attribute 'getitem' Similarly, if I try to use another optimization technique in Platypus (CMAES instead of SMPSO): Traceback (most recent call last):įile "build\bdist.win-amd64\egg\platypus\algorithms.py", line 1074, in stepįile "build\bdist.win-amd64\egg\platypus\algorithms.py", line 1134, in initializeįile "build\bdist.win-amd64\egg\platypus\algorithms.py", line 1298, in iterateįile "build\bdist.win-amd64\egg\platypus\core.py", line 378, in evaluate_allįile "build\bdist.win-amd64\egg\platypus\evaluator.py", line 88, in evaluate_allįile "build\bdist.win-amd64\egg\platypus\evaluator.py", line 55, in run_jobįile "build\bdist.win-amd64\egg\platypus\core.py", line 345, in runįile "build\bdist.win-amd64\egg\platypus\core.py", line 518, in evaluateįile "build\bdist.win-amd64\egg\platypus\core.py", line 160, in callįile "build\bdist.win-amd64\egg\platypus\types.py", line 147, in decodeįile "build\bdist.win-amd64\egg\platypus\tools.py", line 521, in gray2bin TypeError: unsupported operand type(s) for -: 'list' and 'list' Results into: Traceback (most recent call last):įile "D:\MyProjects\Drilling\test_platypus.py", line 62, inįile "D:\MyProjects\Drilling\test_platypus.py", line 19, in AsIntegerįile "build\bdist.win-amd64\egg\platypus\core.py", line 405, in runįile "build\bdist.win-amd64\egg\platypus\algorithms.py", line 820, in stepįile "build\bdist.win-amd64\egg\platypus\algorithms.py", line 838, in iterateįile "build\bdist.win-amd64\egg\platypus\algorithms.py", line 1008, in _update_velocities Problem = Problem(3, 2) # define 3 inputs and 1 objective (and no constraints) It appears to me that Platypus should support variables (optimization parameters) as integers out of the box, however this simple problem (two objectives, three variables, no constraints and Integer variables with SMPSO): from platypus import * I am exploring the Platypus library for multi-objective optimization in Python.
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