## 3 Proposed Model
### Indicators  
Table 1 presents the proposed indicator system in detail with six main factors and 36 sub-factors. Figure 1: Sequence to sequence (seq2 seq) framework. Investment environment could be separated into six sub-indexes. Getting electricity is a country's fundamental ability to make the energy industry running smoothly. Starting a business helps one to judge if the investment could successfully get started. Dealing with construction permits helps one to tell if the invested energy facilities could be built smoothly. Enforcing contracts shows a country the ability to fulfill the investment cooperation contract. Resolving insolvency shows a country's ability to deal with the situation that in case invested companies go bankrupt. Paying tax shows the ability of a country to make itself fiscal stable. Political risk also plays a vital role for foreign investors. The internal conflict shows the country's government's ability to stabilize its domestic politic environment. The external conflict shows a country's ability to deal with diplomatic issues with other countries. Government stability is concerned with whether or not the cooperation could still exist if the government is overthrown. Corruption is also really important as a corrupted government may make the invested project really inefficiency. A good law and order can also make sure that the invested project could be conducted smoothly. Democratic accountability is also important to ensure that the project will not influenced by some unseen factors, like government corruption. Economic foundation is mainly about the GDP data. Real GDP growth and GDP per capita can reflect the economic power and if its market is energetic or not. Budget balance as a percentage of GDP and foreign debt as a percentage of GDP shows a country's ability \begin{table}
\begin{tabular}{c c c} \hline \hline
**Dimension** & **Indicators** & **Data Source** \\ \hline \multirow{6}{*}{Investment environment} & Getting electricity & World Bank [36] \\  & Starting a business & World Bank \\  & Dealing with construction permits & World Bank \\  & Enforcing contracts & World Bank \\  & Resolving insolvency & World Bank \\  & Paying tax & World Bank \\ \hline \multirow{6}{*}{Political risk} & Internal conflict & ICRG [37] \\  & External conflict & ICRG \\  & Government stability & ICRG \\  & Corruption & ICRG \\  & Law and order & ICRG \\  & Democratic accountability & ICRG \\ \hline \multirow{6}{*}{Economic foundation} & Real GDP growth & ICRG \\  & GDP per capita & ICRG \\  & Budget balance as a percentage of GDP & ICRG \\  & Foreign debt as a percentage of GDP & ICRG \\  & Exchange rate stability & ICRG \\  & Annual inflation rate & ICRG \\ \hline \multirow{6}{*}{Environment constraint} & Energy intensity & EIA [38] \\  & Carbon dioxide emissions & EIA \\  & Nitrous oxide emissions & World Bank \\  & Carbon dioxide intensity & EIA \\  & Forest area (\% of land area) & World Bank \\  & PM25 & World Bank \\ \hline \multirow{6}{*}{Resource potential} & Crude oil proved reserves & EIA \\  & Dry natural gas production & EIA \\  & Total oil production & EIA \\  & Crude oil distillation capacity & EIA \\  & Total exports of refined petroleum products & EIA \\  & Proved reserves of natural gas & EIA \\ \hline \multirow{6}{*}{Chinese factor} & Value of contracted projects & China Statistical Yearbook [39] \\  & Outward FDI stock & Statistical Bulletin of China’s Foreign Direct Investment [40] \\ \cline{1-1}  & Years of China’s diplomatic relations & [PERSON] [41] \\ \cline{1-1}  & Value of total imports from China & UN Comtrade Database [42] \\ \cline{1-1}  & Persons abroad of contracted projects and labor services & China Statistical Yearbook \\ \cline{1-1}  & Value of total exports to China & UN Comtrade Database \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Investment risk assessment indicators. to deal with its debt issue. Exchange rate stability and annual inflation rate are also very crucial as they reflect a country's ability to make its financial market stable.