Debugging error: json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 10 column 9 (char 209)

[srimayee-27-jnc]

I get the error as mentioned in the title. Line 10 is "],". I do not understand what property I must enclose in double quotes. I have tried changing the content of line 10, with contents from other lines (in a manner consistent with the DPGEN param.json file format), however, I still get the same error at the same line and same column (line 10 and column 9). We have also fed param.json file to online JSON file formatter & validator. Our JSON files have no formatting errors. The error is specific to DPGEN. However, I do not know how to debug this. Kindly advice. Many thanks.

{
    "type_map": ["A","B","C"],
    "mass_map": [12,18,9],
    "init_data_prefix": "../",
    "init_data_sys": ["init/02.md/sys-0004-0001/deepmd"],
    "sys_configs_prefix": "../",
    "sys_configs": [
        ["init/01.structures/sys-0004-0001/initial-stable-ML-MD/0000*/POSCAR"],
        ["init/01.structures/sys-0004-0001/unstable-ML-MD/0000*/POSCAR"]
    ],   
    "_comment": " that's all.Here starts the training.. ",
    "numb_models": 4,
    "default_training_param": {
        "model": {
            "type_map": ["A","B","C"],
            "descriptor": {
                "type": "se_e2_a",
                "sel": "auto",
                "rcut_smth": 5.0,
                "rcut": 12,
                "neuron": [
                    25,
                    50,
                    100
                ],
                "resnet_dt": false,
                "axis_neuron": 12,
                "activation_function": "tanh", 
                "trainable": true,	
                "seed": 1
            },
            "fitting_net": {
                "type": "ener",
                "neuron": [
                    240,
                    240,
                    240
                ],
                "resnet_dt": true,
                "seed": 1
            }
        },
        "learning_rate": {
            "type": "exp",
            "start_lr": 0.1,
            "decay_steps": 1000,
            "stop_lr": 3.51E-05
        },
        "loss": {
            "start_pref_e": 0.02,
            "limit_pref_e": 1,
            "start_pref_f": 1000,
            "limit_pref_f": 1,
            "start_pref_v": 0.0,
            "limit_pref_v": 0.0
        },
        "training": {
            "stop_batch": 1000,
            "disp_file": "lcurve.out",
            "disp_freq": 100,
            "numb_test": 4,
            "save_freq": 1000,
            "save_ckpt": "model.ckpt",
            "disp_training": true,
            "time_training": true,
            "profiling": false,
            "profiling_file": "timeline.json",
            "_comment": "that's all"
        }
    },
    "model_devi_dt": 0.001,
    "model_devi_skip": 0,
    "model_devi_f_trust_lo": 0.05,
    "model_devi_f_trust_hi": 0.15,
    "model_devi_e_trust_lo": 10000000000.0,
    "model_devi_e_trust_hi": 10000000000.0,
    "model_devi_clean_traj": true,
    "model_devi_jobs": [
        {
            "sys_idx": [
                0
            ],
            "temps": [
                500
            ],
            "press": [
                1.0
            ],
            "trj_freq": 10,
            "nsteps": 300,
            "ensemble": "nvt",
            "_idx": "00"
        },
        {
            "sys_idx": [
                1
            ],
            "temps": [
                500
            ],
            "press": [
                1.0
            ],
            "trj_freq": 10,
            "nsteps": 3000,
            "ensemble": "nvt",
            "_idx": "01"
        }
    ],
    "fp_style": "vasp",
    "shuffle_poscar": false,
    "fp_task_max": 20,
    "fp_task_min": 5,
    "fp_pp_path": "./",
    "fp_pp_files": [
        "POTCAR-A",
        "POTCAR-B",
        "POTCAR-C"
    ],
    "_comments": "We can only provide empty files in public, you should provide valid POTCARS yourself when running DP-GEN",
    "fp_incar": "./INCAR"
}

[biglinn]

Maybe the problem is not with param.json, but with machine.json.

[srimayee-27-jnc]

Thank you.