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# File 'lib/easy_ml/data/preprocessor/simple_imputer.rb', line 139
def save
FileUtils.mkdir_p(File.dirname(file_path))
all_statistics = (File.exist?(file_path) ? JSON.parse(File.read(file_path)) : {}).deep_symbolize_keys
deep_symbolize_keys!
serialized = serialize_statistics(@statistics)
all_statistics[attribute] = {} unless all_statistics.key?(attribute)
all_statistics[attribute][@strategy] = serialized[attribute.to_sym][@strategy.to_sym]
File.open(file_path, "w") do |file|
file.write(JSON.pretty_generate(all_statistics))
end
end
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