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docs improvement (#730)

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@@ -34,9 +34,14 @@ Name Description
`Workflow` layer `Workflow` layer covers the whole workflow of quantitative investment.
`Information Extractor` extracts data for models. `Forecast Model` focuses
on producing all kinds of forecast signals (e.g. _alpha_, risk) for other
modules. With these signals `Portfolio Generator` will generate the target
portfolio and produce orders to be executed by `Order Executor`.
on producing all kinds of forecast signals (e.g. *alpha*, risk) for other
modules. With these signals `Decision Generator` will generate the target
trading decisions(i.e. portfolio, orders) to be executed by `Execution Env`
(i.e. the trading market). There may be multiple levels of `Trading Agent`
and `Execution Env` (e.g. an *order executor trading agent and intraday
order execution environment* could behave like an interday trading
environment and nested in *daily portfolio management trading agent and
interday trading environment* )
`Interface` layer `Interface` layer tries to present a user-friendly interface for the underlying
system. `Analyser` module will provide users detailed analysis reports of