Github user njayaram2 commented on a diff in the pull request:
https://github.com/apache/madlib/pull/288#discussion_r200444598
--- Diff: src/ports/postgres/modules/cols_vec/cols2vec.py_in ---
@@ -0,0 +1,110 @@
+"""
+@file cols2vec.py_in
+
+@brief Utility to convert Columns to array
+
+"""
+
+import plpy
+from utilities.control import MinWarning
+from utilities.utilities import split_quoted_delimited_str
+from utilities.utilities import _string_to_array
+from utilities.validate_args import columns_exist_in_table
+from utilities.validate_args import is_var_valid
+from utilities.validate_args import get_cols
+from utilities.validate_args import quote_ident
+from utilities.utilities import py_list_to_sql_string
+
+
+m4_changequote(`<!', `!>')
+
+
+def validate_cols2vec_args(source_table, output_table,
+ list_of_features, list_of_features_to_exclude,
cols_to_output, **kwargs):
+ """
+ Function to validate input parameters
+ """
+ if list_of_features.strip() != '*':
+ if not (list_of_features and list_of_features.strip()):
+ plpy.error("Features to include is empty")
+
+ if list_of_features.strip() != '*':
+ if not columns_exist_in_table(
+ source_table,
split_quoted_delimited_str(list_of_features)):
+ plpy.error(
+ "Invalid columns to list_of_features
({0})".format(list_of_features))
+
+ if cols_to_output and cols_to_output.strip() != '*':
+ if not columns_exist_in_table(
+ source_table, _string_to_array(cols_to_output)):
+ plpy.error("Invalid columns to output list ({0})".
+ format(cols_to_output))
+
+
+def cols2vec(schema_madlib, source_table, output_table, list_of_features,
+ list_of_features_to_exclude=None, cols_to_output=None,
**kwargs):
+ """
+ Args:
+ @param schema_madlib: Name of MADlib schema
+ @param model: Name of table containing the
tree model
+ @param source_table: Name of table containing
prediction data
+ @param output_table: Name of table to output the
results
+ @param list_of_features: Comma-separated string of
column names or
+ expressions to put into
feature array.
+ Can also be a '*' implying all
columns
+ are to be put into feature
array.
+ @param list_of_features_to_exclude: Comma-separated string of
column names
+ to exclude from the feature
array
+ @param cols_to_output: Comma-separated string of
column names
+ from the source table to keep
in the output table,
+ in addition to the feature
array.
+
+ Returns:
+ None
+
+ """
+
+ with MinWarning('warning'):
+ validate_cols2vec_args(source_table, output_table,
list_of_features,
+ list_of_features_to_exclude,
cols_to_output, **kwargs)
+
+ all_cols = ''
+ feature_cols = ''
+ if list_of_features.strip() == '*':
+ all_cols = get_cols(source_table, schema_madlib)
+ all_col_set = set(list(all_cols))
+ exclude_set = set(split_quoted_delimited_str(
+ list_of_features_to_exclude))
+ feature_set = all_col_set - exclude_set
+ feature_cols = py_list_to_sql_string(
+ list(feature_set), "text", False)
+ filtered_list_of_features = ",".join(
+ feat for feat in list(feature_set))
+ else:
+ feature_list = split_quoted_delimited_str(list_of_features)
+ feature_exclude = split_quoted_delimited_str(
+ list_of_features_to_exclude)
+ return_set = set(feature_list) - set(feature_exclude)
+ feature_cols = py_list_to_sql_string(
+ list(return_set), "text", False)
+ filtered_list_of_features = ",".join(
+ feat for feat in feature_list if feat in return_set)
+
+ output_cols = ''
+ if cols_to_output:
+ output_cols_list = [', '.join(get_cols(source_table,
schema_madlib)) if col == '*' else col
+ for col in
split_quoted_delimited_str(cols_to_output)]
+ output_cols = ', '.join(output_cols_list) + ","
+
+ plpy.execute("""
+ CREATE TABLE {output_table} AS
+ select {output_cols}
+ array[{filtered_list_of_features}] as feature_vector
+ from {source_table}
+ """.format(**locals()))
+
+ plpy.execute("""
--- End diff --
@iyerr3 The vec2cols story
(https://issues.apache.org/jira/browse/MADLIB-1240) might consume this summary
table if provided as the `dictionary` param in that module.
---
