add pretrained form energy model for mp.2019.04.01, 134k structures

mvl_models/mp2019/README.md

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+## Pre-trained models using Materials Project data
+
+- `mp.2019.04.01.hdf5` is a formation energy model of 133420 crystal structures in Materials Project as of April 1st 2019. The model is trained with 0.8:0.1:0.1 (train:validation:test) ratios. The MAE errors for train, validation and test are 7.2, 24.4, and 25.5 meV/atom, respectively.
+

mvl_models/mp2019/mp.2019.04.01.hdf5.json

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+{"graph_convertor": {"@module": "megnet.data.crystal", "@class": "CrystalGraph", "atom_convertor": {"@module": "megnet.data.graph", "@class": "DummyConvertor"}, "bond_convertor": {"@module": "megnet.data.graph", "@class": "GaussianDistance", "centers": {"@module": "numpy", "@class": "array", "dtype": "float64", "data": [0.0, 0.06060606060606061, 0.12121212121212122, 0.18181818181818182, 0.24242424242424243, 0.30303030303030304, 0.36363636363636365, 0.42424242424242425, 0.48484848484848486, 0.5454545454545454, 0.6060606060606061, 0.6666666666666667, 0.7272727272727273, 0.7878787878787878, 0.8484848484848485, 0.9090909090909092, 0.9696969696969697, 1.0303030303030303, 1.0909090909090908, 1.1515151515151516, 1.2121212121212122, 1.2727272727272727, 1.3333333333333335, 1.393939393939394, 1.4545454545454546, 1.5151515151515151, 1.5757575757575757, 1.6363636363636365, 1.696969696969697, 1.7575757575757576, 1.8181818181818183, 1.878787878787879, 1.9393939393939394, 2.0, 2.0606060606060606, 2.121212121212121, 2.1818181818181817, 2.2424242424242427, 2.303030303030303, 2.3636363636363638, 2.4242424242424243, 2.484848484848485, 2.5454545454545454, 2.606060606060606, 2.666666666666667, 2.7272727272727275, 2.787878787878788, 2.8484848484848486, 2.909090909090909, 2.9696969696969697, 3.0303030303030303, 3.090909090909091, 3.1515151515151514, 3.2121212121212124, 3.272727272727273, 3.3333333333333335, 3.393939393939394, 3.4545454545454546, 3.515151515151515, 3.5757575757575757, 3.6363636363636367, 3.6969696969696972, 3.757575757575758, 3.8181818181818183, 3.878787878787879, 3.9393939393939394, 4.0, 4.0606060606060606, 4.121212121212121, 4.181818181818182, 4.242424242424242, 4.303030303030303, 4.363636363636363, 4.424242424242425, 4.484848484848485, 4.545454545454546, 4.606060606060606, 4.666666666666667, 4.7272727272727275, 4.787878787878788, 4.848484848484849, 4.909090909090909, 4.96969696969697, 5.03030303030303, 5.090909090909091, 5.151515151515151, 5.212121212121212, 5.2727272727272725, 5.333333333333334, 5.3939393939393945, 5.454545454545455, 5.515151515151516, 5.575757575757576, 5.636363636363637, 5.696969696969697, 5.757575757575758, 5.818181818181818, 5.878787878787879, 5.9393939393939394, 6.0]}, "width": 0.5}, "cutoff": 5.0}}