update readme (#73)

README.md

@@ -7,9 +7,17 @@ Code generator for implicit gemm algorithm (generic tensor contraction)
 # Generate kernel
 since f-string is utilized in python, require python >= 3.6 to run.
 ```
-# generate code based on tunable configuration
-python3 igemm_codegen.py config/igemm_bwd_gtc.config
+# generate code based on tunable configuration, use one of following command to generate each direction
+python3 igemm_codegen.py config/igemm_fwd_gtc_gfx908.config
+python3 igemm_codegen.py config/igemm_bwd_gtc_gfx908.config
+python3 igemm_codegen.py config/igemm_wrw_gtc_gfx908.config
+
+# or auto generate code for all possible combinations, use one of following command to generate each direction
+python3 igemm_codegen.py config/igemm_fwd_gtc_gfx908_seq.config
+python3 igemm_codegen.py config/igemm_bwd_gtc_gfx908_seq.config
+python3 igemm_codegen.py config/igemm_wrw_gtc_gfx908_seq.config
 ```
+
 The output file will result in `out` directory. result in a assembly file `*.s` and several `*.inc` for different tile size, a codeobject `*.hsaco` and a host driver executable `conv_driver.exe`. This executable accept same cmdline argument as [MIOpenDriver](https://rocmsoftwareplatform.github.io/MIOpen/doc/html/driver.html). e.g.
 ```
 ./conv_driver.exe  conv -n 128 -c 1024 -H 17 -W 17 -k 1024  -y 1 -x 1 -p 0 -q 0 -u 1 -v 1 -l 1 -j 1 -F 2 -V 1