This notebook shows how to use KIM to perform inverse modeling for a cloud chamber model.

# Libraries
from pathlib import Path
import pandas as pd
import os

from kim.map import KIM
from kim.data import Data
from kim.mapping_model import MLP

%load_ext autoreload
%autoreload 2

Read the data#

  • The Output.csv file includes the ensemble of the two parameters to be estimated, represented by \(\mathbf{Y}\).

  • The Input_np_holodec.csv file includes the ensemble of the simulations generated by the cloud chamber model, represented by \(\mathbf{X}\).

# File and folder paths
f_para = Path("./data-holodec-PoissonPertb/Output.csv")
f_state = Path("./data-holodec-PoissonPertb/Input_np_holodec.csv")
# Read the data
df_para, df_state = pd.read_csv(f_para),pd.read_csv(f_state)
y_keys, x_keys = df_para.keys(), df_state.keys()
y, x = df_para.values, df_state.values
x.shape, y.shape
((513, 1458), (513, 2))

Configurations#

Preliminary analysis configuration#

# The random seed used in the statistical significance test
seed_shuffle = 1234

# The folder where the data analysis results will be saved
f_data_save = Path("./results-holodec/data")
# Data configuration
data_params = {
    "xscaler_type": "minmax",  # scaler for the x (input) data
    "yscaler_type": "minmax",  # scaler for the y (output) data
}

# Sensitivity analysis configuration
sensitivity_params = {
    "method": "pc", "metric": "it-knn",
    "sst": True, "ntest": 100, "alpha": 0.05, "k": 3,
    "n_jobs": min(os.cpu_count(), 100), "seed_shuffle": seed_shuffle,  # cap to available CPU cores; raise for HPC nodes
    "verbose": 1
}

Ensemble learning configuration#

# Some basis ensemble learning configuration
Ns_train = 400
Ns_val = 50
hidden_activation = 'sigmoid'
final_activation = 'leaky_relu'
seed_ens = 1024
seed_predict = 3636
seed_dl = 10
seed_model = 100
training_verbose = 1
n_models = 100
n_jobs = min(os.cpu_count(), 20)  # cap to available CPU cores; raise for HPC nodes

# Locations where the ensemble learning results will be saved
f_kim_save1 = Path("./results-holodec/map_many2many")
f_kim_save2 = Path("./results-holodec/map_many2one")
f_kim_save3 = Path("./results-holodec/map_many2one_cond")
# Mapping parameters for each test below
map_configs = {
    "model_type": MLP,
    'n_model': n_models,
    'ensemble_type': 'ens_random',
    'model_hp_choices': {
        "depth": [1,3,5,6],
        "width_size": [3,6,10]
    },
    'model_hp_fixed': {
        "hidden_activation": hidden_activation,
        "final_activation": final_activation,
        "model_seed": seed_model
    },
    'optax_hp_choices': {
        'learning_rate': [0.01, 0.005, 0.003],
    },
    'optax_hp_fixed': {
        'nsteps': 300,
        'optimizer_type': 'adam',
    },
    'dl_hp_choices': {
    },
    'dl_hp_fixed': {
        'dl_seed': seed_dl,
        'num_train_sample': Ns_train,
        'num_val_sample': Ns_val,
        'batch_size': 64
    },
    'ens_seed': seed_ens,
    'training_parallel': True,
    'parallel_config': {
        'n_jobs': n_jobs, 
        'backend': 'loky',
        'verbose': 1
    },
    'device': None,
}

Perform preliminary data analysis#

The analysis include both sensitivity analysis and redundancy filtering check

Expected runtime: about 3 minutes on a 16-core laptop for the 1458 inputs x 2 outputs with ntest=100 shuffles (it scales with the number of cores given by n_jobs). The ensemble training further below takes another ~6 minutes. The results are saved to f_data_save at the end of this notebook, so on a repeated run you can skip this step and load them instead:

data = Data(x, y, **data_params)
data.load(f_data_save)
data = Data(x, y, **data_params, Ns_train=Ns_train, Ns_val=Ns_val)
data.calculate_sensitivity(**sensitivity_params)
Using the kNN-based information theoretic metrics ...
Performing pairwise analysis to remove insensitive inputs ...
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Performing conditional independence testing to remove redundant inputs ...

Train the inverse mapping#

Now, let’s train the inverse mappings via ensemble learning. We are training three types of inverse mappings:

  • kim1: The naive inverse mapping from all \(\mathbf{Y}\) to all \(\mathbf{X}\)

  • kim2: The knowledge-informed inverse mapping from sensitive \(\mathbf{Y}\) to each of \(\mathbf{X}\) using global sensitivity analysis

  • kim3: The knowledge-informed inverse mapping from sensitive \(\mathbf{Y}\) to each of \(\mathbf{X}\) using global sensitivity analysis + redundancy filtering check

# Initialize three diffferent KIMs
kim1 = KIM(data, map_configs, map_option='many2many')
kim2 = KIM(data, map_configs, mask_option="sensitivity", map_option='many2one')
kim3 = KIM(data, map_configs, mask_option="cond_sensitivity", map_option='many2one')

# Train the mappings
kim1.train()
kim2.train()
kim3.train()
 Performing ensemble training in parallel with 100 model configurations...
[Parallel(n_jobs=20)]: Using backend LokyBackend with 20 concurrent workers.
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  warnings.warn(

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[Parallel(n_jobs=20)]: Done 100 out of 100 | elapsed:   32.1s finished
[Parallel(n_jobs=20)]: Using backend LokyBackend with 20 concurrent workers.
Training completes.

 Performing ensemble training in parallel with 100 model configurations...
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[Parallel(n_jobs=20)]: Done 100 out of 100 | elapsed:   24.9s finished
[Parallel(n_jobs=20)]: Using backend LokyBackend with 20 concurrent workers.
Training completes.

 Performing ensemble training in parallel with 100 model configurations...
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  warnings.warn(
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Training completes.

 Performing ensemble training in parallel with 100 model configurations...
[Parallel(n_jobs=20)]: Done 100 out of 100 | elapsed:   23.0s finished
[Parallel(n_jobs=20)]: Using backend LokyBackend with 20 concurrent workers.
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  warnings.warn(

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100%|██████████| 300/300 [00:04<00:00, 74.91it/s]

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100%|██████████| 300/300 [00:04<00:00, 74.58it/s]

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[Parallel(n_jobs=20)]: Done 100 out of 100 | elapsed:   25.1s finished
[Parallel(n_jobs=20)]: Using backend LokyBackend with 20 concurrent workers.
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Training completes.

 Performing ensemble training in parallel with 100 model configurations...
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[Parallel(n_jobs=20)]: Done 100 out of 100 | elapsed:   17.6s finished
Training completes.

Save all the results to disk#

# Preliminary analysis results
data.save(f_data_save)

# Inverse mapping results
kim1.save(f_kim_save1)
kim2.save(f_kim_save2)
kim3.save(f_kim_save3)