Update 'defaults'

defaults

@@ -4,6 +4,6 @@
     "pickle":"oss://pgx-source-data/CBCGA2020/RNA-seq/intermediate-results-temp/Alternative_Splicing/spladder/genes_graph_conf2_sorted_pickle/",
     "count_hdf5":"oss://pgx-source-data/CBCGA2020/RNA-seq/intermediate-results-temp/Alternative_Splicing/spladder/single_count_hdf5/",
     "spladder_docker":"registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/spladder:v2.4.2",
-    "spladder_cluster":"OnDemand bcs.a2.7xlarge img-ubuntu-vpc",
+    "spladder_cluster":"OnDemand bcs.a2.xlarge img-ubuntu-vpc",
     "disk_size":"200"
     }