


'''simple docstring'''

from typing import Any





def __snake_case      (   UpperCAmelCase_		:		list      ,       UpperCAmelCase_		:		list      ,       UpperCAmelCase_		:		dict      ,       UpperCAmelCase_		:		dict      ,       UpperCAmelCase_		:		dict      ,       ):
 _validation(
     UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_      ,       )
 # Creates data structures and fill initial step
 lowerCamelCase_  				=						{}
 lowerCamelCase_  				=						{}
 for state in states_space:
  lowerCamelCase_  				=						observations_space[0]
  lowerCamelCase_  				=						(
      initial_probabilities[state] * emission_probabilities[state][observation]
  )
  lowerCamelCase_  				=						None

 # Fills the data structure with the probabilities of
 # different transitions and pointers to previous states
 for o in range(1      ,       len(UpperCAmelCase_	)	):
  lowerCamelCase_  				=						observations_space[o]
  lowerCamelCase_  				=						observations_space[o - 1]
  for state in states_space:
   # Calculates the argmax for probability function
   lowerCamelCase_  				=						""
   lowerCamelCase_  				=						-1
   for k_state in states_space:
    lowerCamelCase_  				=						(
        probabilities[(k_state, prior_observation)]
        * transition_probabilities[k_state][state]
        * emission_probabilities[state][observation]
    )
    if probability > max_probability:
     lowerCamelCase_  				=						probability
     lowerCamelCase_  				=						k_state

            # Update probabilities and pointers dicts
   lowerCamelCase_  				=						(
       probabilities[(arg_max, prior_observation)]
       * transition_probabilities[arg_max][state]
       * emission_probabilities[state][observation]
   )

   lowerCamelCase_  				=						arg_max

    # The final observation
 lowerCamelCase_  				=						observations_space[len(UpperCAmelCase_	) - 1]

 # argmax for given final observation
 lowerCamelCase_  				=						""
 lowerCamelCase_  				=						-1
 for k_state in states_space:
  lowerCamelCase_  				=						probabilities[(k_state, final_observation)]
  if probability > max_probability:
   lowerCamelCase_  				=						probability
   lowerCamelCase_  				=						k_state
 lowerCamelCase_  				=						arg_max

 # Process pointers backwards
 lowerCamelCase_  				=						last_state
 lowerCamelCase_  				=						[]
 for o in range(len(UpperCAmelCase_	) - 1      ,       -1      ,       -1	):
  result.append(UpperCAmelCase_	)
  lowerCamelCase_  				=						pointers[previous, observations_space[o]]
 result.reverse()

 return result





def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       ):
 _validate_not_empty(
     UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_      ,       )
 _validate_lists(UpperCAmelCase_      ,       UpperCAmelCase_	)
 _validate_dicts(
     UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_	)





def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       ):
 if not all(
     [
         observations_space,
         states_space,
         initial_probabilities,
         transition_probabilities,
         emission_probabilities,
     ]	):
  raise ValueError("There's an empty parameter"	)





def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any	):
 _validate_list(UpperCAmelCase_      ,       "observations_space"	)
 _validate_list(UpperCAmelCase_      ,       "states_space"	)





def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		str	):
 if not isinstance(_object      ,       UpperCAmelCase_	):
  lowerCamelCase_  				=						F'''{var_name} must be a list'''
  raise ValueError(UpperCAmelCase_	)
 else:
  for x in _object:
   if not isinstance(UpperCAmelCase_      ,       UpperCAmelCase_	):
    lowerCamelCase_  				=						F'''{var_name} must be a list of strings'''
    raise ValueError(UpperCAmelCase_	)





def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       ):
 _validate_dict(UpperCAmelCase_      ,       "initial_probabilities"      ,       UpperCAmelCase_	)
 _validate_nested_dict(UpperCAmelCase_      ,       "transition_probabilities"	)
 _validate_nested_dict(UpperCAmelCase_      ,       "emission_probabilities"	)





def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		str	):
 _validate_dict(_object      ,       UpperCAmelCase_      ,       UpperCAmelCase_	)
 for x in _object.values():
  _validate_dict(UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_      ,       UpperCAmelCase_	)





def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		str      ,       UpperCAmelCase_		:		type      ,       UpperCAmelCase_		:		bool = False	):
 if not isinstance(_object      ,       UpperCAmelCase_	):
  lowerCamelCase_  				=						F'''{var_name} must be a dict'''
  raise ValueError(UpperCAmelCase_	)
 if not all(isinstance(UpperCAmelCase_      ,       UpperCAmelCase_	) for x in _object	):
  lowerCamelCase_  				=						F'''{var_name} all keys must be strings'''
  raise ValueError(UpperCAmelCase_	)
 if not all(isinstance(UpperCAmelCase_      ,       UpperCAmelCase_	) for x in _object.values()	):
  lowerCamelCase_  				=						"nested dictionary " if nested else ""
  lowerCamelCase_  				=						F'''{var_name} {nested_text}all values must be {value_type.__name__}'''
  raise ValueError(UpperCAmelCase_	)


if __name__ == "__main__":
     from doctest import testmod

     testmod()







'''simple docstring'''

import contextlib
import os
import sqlitea

import pytest

from datasets import Dataset, Features, Value
from datasets.io.sql import SqlDatasetReader, SqlDatasetWriter

from ..utils import assert_arrow_memory_doesnt_increase, assert_arrow_memory_increases, require_sqlalchemy





def __snake_case      (   UpperCAmelCase_		:		Optional[int]      ,       UpperCAmelCase_		:		Dict	):
 assert isinstance(UpperCAmelCase_      ,       UpperCAmelCase_	)
 assert dataset.num_rows == 4
 assert dataset.num_columns == 3
 assert dataset.column_names == ["col_1", "col_2", "col_3"]
 for feature, expected_dtype in expected_features.items():
  assert dataset.features[feature].dtype == expected_dtype





@require_sqlalchemy
@pytest.mark.parametrize("keep_in_memory"      ,       [False, True]	)
def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		List[str]      ,       UpperCAmelCase_		:		Union[str, Any]	):
 lowerCamelCase_  				=						tmp_path / "cache"
 lowerCamelCase_  				=						{"col_1": "string", "col_2": "int64", "col_3": "float64"}
 with assert_arrow_memory_increases() if keep_in_memory else assert_arrow_memory_doesnt_increase():
  lowerCamelCase_  				=						SqlDatasetReader(
      "dataset"      ,       "sqlite:///" + sqlite_path      ,       cache_dir=UpperCAmelCase_      ,       keep_in_memory=UpperCAmelCase_	).read()
 _check_sql_dataset(UpperCAmelCase_      ,       UpperCAmelCase_	)





@require_sqlalchemy
@pytest.mark.parametrize(
    "features"      ,       [
        None,
        {"col_1": "string", "col_2": "int64", "col_3": "float64"},
        {"col_1": "string", "col_2": "string", "col_3": "string"},
        {"col_1": "int32", "col_2": "int32", "col_3": "int32"},
        {"col_1": "float32", "col_2": "float32", "col_3": "float32"},
    ]      ,       )
def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Optional[Any]      ,       UpperCAmelCase_		:		List[str]      ,       UpperCAmelCase_		:		str	):
 lowerCamelCase_  				=						tmp_path / "cache"
 lowerCamelCase_  				=						{"col_1": "string", "col_2": "int64", "col_3": "float64"}
 lowerCamelCase_  				=						features.copy() if features else default_expected_features
 lowerCamelCase_  				=						(
     Features({feature: Value(UpperCAmelCase_	) for feature, dtype in features.items()}	) if features is not None else None
 )
 lowerCamelCase_  				=						SqlDatasetReader("dataset"      ,       "sqlite:///" + sqlite_path      ,       features=UpperCAmelCase_      ,       cache_dir=UpperCAmelCase_	).read()
 _check_sql_dataset(UpperCAmelCase_      ,       UpperCAmelCase_	)





def __snake_case      (   UpperCAmelCase_		:		Union[str, Any]	):
 with contextlib.closing(sqlitea.connect(UpperCAmelCase_	)	) as con:
  lowerCamelCase_  				=						con.cursor()
  cur.execute("SELECT * FROM dataset"	)
  for row in cur:
   yield row





@require_sqlalchemy
def __snake_case      (   UpperCAmelCase_		:		Dict      ,       UpperCAmelCase_		:		Optional[Any]      ,       UpperCAmelCase_		:		List[str]	):
 lowerCamelCase_  				=						tmp_path / "cache"
 lowerCamelCase_  				=						os.path.join(UpperCAmelCase_      ,       "tmp.sql"	)
 lowerCamelCase_  				=						SqlDatasetReader("dataset"      ,       "sqlite:///" + sqlite_path      ,       cache_dir=UpperCAmelCase_	).read()
 SqlDatasetWriter(UpperCAmelCase_      ,       "dataset"      ,       "sqlite:///" + output_sqlite_path      ,       num_proc=1	).write()

 lowerCamelCase_  				=						iter_sql_file(UpperCAmelCase_	)
 lowerCamelCase_  				=						iter_sql_file(UpperCAmelCase_	)

 for rowa, rowa in zip(UpperCAmelCase_      ,       UpperCAmelCase_	):
  assert rowa == rowa





@require_sqlalchemy
def __snake_case      (   UpperCAmelCase_		:		Union[str, Any]      ,       UpperCAmelCase_		:		Union[str, Any]      ,       UpperCAmelCase_		:		Tuple	):
 lowerCamelCase_  				=						tmp_path / "cache"
 lowerCamelCase_  				=						os.path.join(UpperCAmelCase_      ,       "tmp.sql"	)
 lowerCamelCase_  				=						SqlDatasetReader("dataset"      ,       "sqlite:///" + sqlite_path      ,       cache_dir=UpperCAmelCase_	).read()
 SqlDatasetWriter(UpperCAmelCase_      ,       "dataset"      ,       "sqlite:///" + output_sqlite_path      ,       num_proc=2	).write()

 lowerCamelCase_  				=						iter_sql_file(UpperCAmelCase_	)
 lowerCamelCase_  				=						iter_sql_file(UpperCAmelCase_	)

 for rowa, rowa in zip(UpperCAmelCase_      ,       UpperCAmelCase_	):
  assert rowa == rowa







@require_sqlalchemy
def __snake_case      (   UpperCAmelCase_		:		Any      ,       UpperCAmelCase_		:		Tuple      ,       UpperCAmelCase_		:		Tuple	):
 lowerCamelCase_  				=						tmp_path / "cache"
 lowerCamelCase_  				=						os.path.join(UpperCAmelCase_      ,       "tmp.sql"	)
 lowerCamelCase_  				=						SqlDatasetReader("dataset"      ,       "sqlite:///" + sqlite_path      ,       cache_dir=UpperCAmelCase_	).read()
 with pytest.raises(UpperCAmelCase_	):
  SqlDatasetWriter(UpperCAmelCase_      ,       "dataset"      ,       "sqlite:///" + output_sqlite_path      ,       num_proc=0	).write()



