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types.py
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# Copyright 2022 The Feast Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from abc import ABC, abstractmethod
from enum import Enum
from typing import Dict, Union
from feast.value_type import ValueType
PRIMITIVE_FEAST_TYPES_TO_VALUE_TYPES = {
"INVALID": "UNKNOWN",
"BYTES": "BYTES",
"STRING": "STRING",
"INT32": "INT32",
"INT64": "INT64",
"FLOAT64": "DOUBLE",
"FLOAT32": "FLOAT",
"BOOL": "BOOL",
"UNIX_TIMESTAMP": "UNIX_TIMESTAMP",
}
class ComplexFeastType(ABC):
"""
A ComplexFeastType represents a structured type that is recognized by Feast.
"""
def __init__(self):
"""Creates a ComplexFeastType object."""
pass
@abstractmethod
def to_value_type(self) -> ValueType:
"""
Converts a ComplexFeastType object to the corresponding ValueType enum.
"""
raise NotImplementedError
def __hash__(self):
return hash(self.to_value_type().value)
def __eq__(self, other):
return self.to_value_type() == other.to_value_type()
class PrimitiveFeastType(Enum):
"""
A PrimitiveFeastType represents a primitive type in Feast.
Note that these values must match the values in /feast/protos/types/Value.proto.
"""
INVALID = 0
BYTES = 1
STRING = 2
INT32 = 3
INT64 = 4
FLOAT64 = 5
FLOAT32 = 6
BOOL = 7
UNIX_TIMESTAMP = 8
def to_value_type(self) -> ValueType:
"""
Converts a PrimitiveFeastType object to the corresponding ValueType enum.
"""
value_type_name = PRIMITIVE_FEAST_TYPES_TO_VALUE_TYPES[self.name]
return ValueType[value_type_name]
def __str__(self):
return PRIMITIVE_FEAST_TYPES_TO_STRING[self.name]
def __eq__(self, other):
if isinstance(other, PrimitiveFeastType):
return self.value == other.value
else:
return False
def __hash__(self):
return hash((PRIMITIVE_FEAST_TYPES_TO_STRING[self.name]))
Invalid = PrimitiveFeastType.INVALID
Bytes = PrimitiveFeastType.BYTES
String = PrimitiveFeastType.STRING
Bool = PrimitiveFeastType.BOOL
Int32 = PrimitiveFeastType.INT32
Int64 = PrimitiveFeastType.INT64
Float32 = PrimitiveFeastType.FLOAT32
Float64 = PrimitiveFeastType.FLOAT64
UnixTimestamp = PrimitiveFeastType.UNIX_TIMESTAMP
SUPPORTED_BASE_TYPES = [
Invalid,
String,
Bytes,
Bool,
Int32,
Int64,
Float32,
Float64,
UnixTimestamp,
]
PRIMITIVE_FEAST_TYPES_TO_STRING = {
"INVALID": "Invalid",
"STRING": "String",
"BYTES": "Bytes",
"BOOL": "Bool",
"INT32": "Int32",
"INT64": "Int64",
"FLOAT32": "Float32",
"FLOAT64": "Float64",
"UNIX_TIMESTAMP": "UnixTimestamp",
}
class Array(ComplexFeastType):
"""
An Array represents a list of types.
Attributes:
base_type: The base type of the array.
"""
base_type: Union[PrimitiveFeastType, ComplexFeastType]
def __init__(self, base_type: Union[PrimitiveFeastType, ComplexFeastType]):
if base_type not in SUPPORTED_BASE_TYPES:
raise ValueError(
f"Type {type(base_type)} is currently not supported as a base type for Array."
)
self.base_type = base_type
def to_value_type(self) -> ValueType:
assert isinstance(self.base_type, PrimitiveFeastType)
value_type_name = PRIMITIVE_FEAST_TYPES_TO_VALUE_TYPES[self.base_type.name]
value_type_list_name = value_type_name + "_LIST"
return ValueType[value_type_list_name]
def __str__(self):
return f"Array({self.base_type})"
FeastType = Union[ComplexFeastType, PrimitiveFeastType]
VALUE_TYPES_TO_FEAST_TYPES: Dict["ValueType", FeastType] = {
ValueType.UNKNOWN: Invalid,
ValueType.BYTES: Bytes,
ValueType.STRING: String,
ValueType.INT32: Int32,
ValueType.INT64: Int64,
ValueType.DOUBLE: Float64,
ValueType.FLOAT: Float32,
ValueType.BOOL: Bool,
ValueType.UNIX_TIMESTAMP: UnixTimestamp,
ValueType.BYTES_LIST: Array(Bytes),
ValueType.STRING_LIST: Array(String),
ValueType.INT32_LIST: Array(Int32),
ValueType.INT64_LIST: Array(Int64),
ValueType.DOUBLE_LIST: Array(Float64),
ValueType.FLOAT_LIST: Array(Float32),
ValueType.BOOL_LIST: Array(Bool),
ValueType.UNIX_TIMESTAMP_LIST: Array(UnixTimestamp),
}
def from_value_type(
value_type: ValueType,
) -> FeastType:
"""
Converts a ValueType enum to a Feast type.
Args:
value_type: The ValueType to be converted.
Raises:
ValueError: The conversion could not be performed.
"""
if value_type in VALUE_TYPES_TO_FEAST_TYPES:
return VALUE_TYPES_TO_FEAST_TYPES[value_type]
raise ValueError(f"Could not convert value type {value_type} to FeastType.")