update requirements

Author: ivartb

README.md

@@ -61,7 +61,7 @@ export PATH=/path/to/metafx/bin:$PATH
 
 ##### Requirements:
 * JRE 1.8 or higher
-* python3
+* python=3.9.5
 * python libraries listed in `requirements.txt` file. Can be installed using pip <br/>
 ```shell
 python -m pip install --upgrade pip
@@ -72,6 +72,11 @@ pip install -r requirements.txt
 
 Scripts have been tested under *Ubuntu 18.04 LTS*, *Ubuntu 20.04 LTS*, *macOS 11 Big Sur*, and *macOS 12 Monterey*, and should generally work on Linux/macOS.
 
+Multiple cores can be used to speed up computations.
+
+Required RAM grows linearly with the size of the input dataset. Hard drive space for intermediate computations and results also growth linearly. For example, to process 12GB dataset in [tutorial](https://github.com/ctlab/metafx/wiki/MetaFX-tutorial) we used 16GB disk space, 8GB RAM, and 6 threads, which took 1 hour to process.
+
+
 ## Running instructions
 
 To run **_MetaFX_** use the following syntax:

requirements.txt

@@ -1,6 +1,6 @@
-numpy
-pandas
-scikit-learn
-matplotlib
-joblib
-ete3
+numpy==1.21.4
+pandas==1.3.4
+scikit-learn==1.3.0
+matplotlib==3.8.2
+joblib==1.2.0
+ete3==3.1.3