Update feature introduction docs

docs/features/feature-introduction.md

@@ -1,21 +1,57 @@
 # Behavioral Features Introduction
 
-Every phone or Fitbit sensor has a corresponding config section e.g. `[PHONE_CALLS]` in `config.yaml` and 0, 1 or more **providers**. A provider is a script created by the core RAPIDS team or other researchers that extracts behavioral features for that sensor.
-
-If you want to extract features from any sensor, set the corresponding `[PROVIDER][COMPUTE]` variable to `TRUE`, the `[TABLE]` variable to the sensor's table name in your database, and change any other parameters as [desired](/setup/configuration/#sensor-and-features-to-process), and [execute](/setup/execution/) RAPIDS:
-
-!!! example
-    In this example the `config.yaml` file has been configured to extract `PHONE_CALLS` features from a table called `calls`:
-    ```yaml
-    PHONE_CALLS:
-        TABLE: calls
-        PROVIDERS:
-            RAPIDS:
-                COMPUTE: True
-            ...
-    ```
+Every phone or Fitbit sensor has a corresponding config section in `config.yaml`, these sections follow a similar structure and we'll use `PHONE_ACCELEROMETER` as an example to explain this structure.
 
 !!! hint
-    Every time you change any sensor parameters, all the necessary files will be updated as soon as you execute RAPIDS. Some sensors will have specific attributes (like `MESSAGES_TYPES`) so refer to each sensor documentation.
+    We recommend reading this page if you are using RAPIDS for the first time
 
-Click on the left-hand side menu for the full feature catalogue per sensor.
+!!! example "Config section example for `PHONE_ACCELEROMETER`"
+
+    ```yaml
+    # 1) Config section
+    PHONE_ACCELEROMETER:
+        # 2) Parameters for PHONE_ACCELEROMETER
+        TABLE: accelerometer
+
+        # 3) Providers for PHONE_ACCELEROMETER
+        PROVIDERS:
+            # 4) RAPIDS provider
+            RAPIDS:
+                # 4.1) Parameters of RAPIDS provider of PHONE_ACCELEROMETER
+                COMPUTE: False
+                # 4.2) Features of RAPIDS provider of PHONE_ACCELEROMETER
+                FEATURES: ["maxmagnitude", "minmagnitude", "avgmagnitude", "medianmagnitude", "stdmagnitude"]
+                SRC_FOLDER: "rapids" # inside src/features/phone_accelerometer
+                SRC_LANGUAGE: "python"
+            
+            # 5) PANDA provider
+            PANDA:
+                # 5.1) Parameters of RAPIDS provider of PHONE_ACCELEROMETER
+                COMPUTE: False
+                VALID_SENSED_MINUTES: False
+                # 5.2) Features of RAPIDS provider of PHONE_ACCELEROMETER
+                FEATURES:
+                    exertional_activity_episode: ["sumduration", "maxduration", "minduration", "avgduration", "medianduration", "stdduration"]
+                    nonexertional_activity_episode: ["sumduration", "maxduration", "minduration", "avgduration", "medianduration", "stdduration"]
+                SRC_FOLDER: "panda" # inside src/features/phone_accelerometer
+                SRC_LANGUAGE: "python"
+    ```
+
+## Sensor Parameters
+Each sensor configuration section has a `Parameters` subsection (see `#2` in the example). These are parameters that affect different aspects of how the raw data is download, and processed. The `TABLE` parameter exists for every sensor, but some sensors will have extra para meters like [`[PHONE_LOCATIONS]`](/features/phone-locations/). We explain these parameters in a table at the top of each sensor documentation page.
+
+## Sensor Providers
+Each sensor configuration section can have zero, one or more behavioral feature **providers** (see `#2` in the example). A provider is a script created by the core RAPIDS team or other researchers that extracts behavioral features for that sensor. For this accelerometer example we have two providers RAPIDS (see `#4`) and PANDA (see `#5`).
+
+### Provider Parameters
+Each provider has parameters that affect the computation of the behavioral features it offers (see `#4.1` or `#5.1` in the example). These parameters will include at least a `[COMPUTE]` flag that you switch to `True` to extract a provider's behavioral features. 
+
+We explain each provider parameter in a table under the `Parameters description` heading on each provider documentation page.
+
+### Provider Features
+Each provider offers a set of behavioral features (see `#4.2` or `#5.2` in the example). For some providers these features are grouped in an array (like those for `RAPIDS` provider in `#4.2`) but for others they are grouped in a collection of arrays (like those for `PANDAS` provider in `#5.2`) depending on the meaning and purpose of those features. In either case you can delete the features you are not interested in and they will not be included in the sensor's output feature file. 
+
+We explain each behavioral feature in a table under the `Features description` heading on each provider documentation page.
+
+!!! hint
+    Every time you change any sensor parameters, provider parameters or provider features, all the necessary files will be updated as soon as you execute RAPIDS.

docs/setup/execution.md

@@ -31,3 +31,6 @@ After you have [installed](/setup/installation) and [configured](/setup/configur
     ```bash
     ./rapids -j1 -R clean
     ```
+
+!!! done "Ready to extract behavioral features"
+    If you are ready to extract features head over to the [Behavioral Features Introduction](/features/feature-introduction/)