## 4 Experiments
### Experimental Results

Table 3: Estimated weights of risk evaluation indicators for six dimensions based on the statistics from 2013 to 2019. This paper further investigates the sub-factors as shown in the right columns of Table 3. One could observe that a simple but most important factor is the \"years of China's diplomatic relations\". This is because that a longer diplomatic relation usually provides more friendly and reliable bilateral relation, which could help to build a stable investment environment for Chinese companies. The \"Forest area (% of land area)\" is the second important sub-factor, which is unexpected. But it further stresses the importance of dealing with the climate changing in that every country should balance the resource exploitation and environment protection. Another crucial sub-factor is the \"GDP per capita\", which is a fundamental index reflecting a country's economic and developing level. As the resource potential is the most important main index, it is no doubt that \"Crude oil proved reserves\" and \"Proved reserves of natural gas\" are two factors worthwhile to be noticed. These two factors help Chinese companies to have a basic evaluation of how much investment return could be acquired. \"Persons abroad of contracted projects and labor services\" is a factor that cannot be ignored, as well, since it reflects to some extend that how open the target country is to the Chinese investment. With more Chinese workers in the targeted country, the investment project will definitely have a higher probability to achieve success. The detailed assessment results are presented in Table 4 and Figure 3. The scores are calculated via the CRF layer and softmax layer. Overall, 10 countries belongs to the highest risk, 11 countries belong to higher risk, 17 countries belong to medium risk, 10 countries belong to lower risk, and 2 countries belong to lowest risk. Only 12 countries have relatively low risk, which further verifies the importance of risk controlling when investing the \"Belt & Road countries\". It is noticeable that countries having rich fossil energy, like crude oil and natural gas, also belong to lower risk, which further proves the importance of the potential resource factor. Chinese investors have no need to be concerned about the natural resources' acquirement problem. Taking a closer look of Table 4, one could find that, though belonging to the same risk level, they are influenced by different indexes. For example, Russia and Singapore all belong to the lowest risk level; however, Russia has abundant natural resources and stable political environment, while Singapore, as a small country, has limited resources. But Singapore stands out because of its excellent economic foundation and investment environment. Therefore, for energy investment, Singapore may could only be considered as a resource transfer station. On contrary, based on the long-term and friendly diplomatic relation of China and Russia, this paper believes that Russia is the best choice for China to incorporate and invest. Figure 3: The results of the national energy investment risk evaluation. Moving to the lower risk level, one can see that there are several Middle East countries. Considering this region has higher risk of having a war and unstable political environment, it is a bit unexpected to still mark them as lower risk. The reason is that this region has the majority of the fossil resources of the whole world, so it is anyway worthwhile to have investment projects there. Among those countries, UAE, Qatar, and Saudi Arabia have relatively better government stability controlling the internal and external conflicts in the past decade, so they are good targeted countries for Chinese investors. Iran has a relatively stable domestic political environment, but it suffers from poor geopolitical and social networks.